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3GPP TS 23.205 V6.9.0 (2008-03)Technical Specification

3rd Generation Partnership Project;

Technical Specification Group Core Network and Terminals;Bearer-independent circuit-switched core network;

Stage 2(Release 6)

The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented.This Specification is provided for future development work within 3GPPonly. The Organizational Partners accept no liability for any use of this Specification.Specifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Organizational Partners' Publications Offices.


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Keywords

UMTS, network, circuit mode

3GPP

Postal address

3GPP support office address

650 Route des Lucioles - Sophia Antipolis

Valbonne - FRANCETel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16

Internet

http://www.3gpp.org

Copyright Notification

No part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.

2008, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC).All rights reserved.


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Contents

Foreword ..........................................................................................................................................................14

1 Scope......................................................................................................................................................152 References ..............................................................................................................................................15

3 Symbols and abbreviations.....................................................................................................................173.1 Symbols ............................................................... ................................................................ ............................ 173.2 Abbreviations................................................................................................................................................... 173.3 Definitions ............................................................... ....................................................................... ................. 18

4 Main Concepts .......................................................................................................................................184.1 General............................................................................................................................................................. 184.2 Bearer-Independent Call Control..................................................................................................................... 184.3 H.248/MEGACO..................................................................... ................................................................. ....... 18

5 General Circuit Switched Core Network Domain Architecture.............................................................185.1 Logical Architecture ............................................................ ...................................................................... ...... 185.1.1 CS Core Network Nodes............................................................................................................................ 195.1.1.1 MSC Server ........................................................ ................................................................. ................. 195.1.1.2 GMSC Server ............................................................. ................................................................... ....... 195.1.1.3 Media Gateway..................................................................................................................................... 195.1.2 CS Core Network Interfaces and Reference Points.................................................................................... 195.1.2.1 Mc Interface.......................................................................................................................................... 195.1.2.2 Nc Interface ................................................................. .................................................................. ....... 195.1.2.3 Nb Interface.......................................................................................................................................... 195.2 Network Interworking...................................................................................................................................... 205.2.1 Interworking on the Nc Reference Point.................................................................................................... 205.2.2 Interworking on the Nb Reference Point.................................................................................................... 20

6 Call Establishment .................................................................................................................................206.1 Basic Mobile Originating Call......................................................................................................................... 206.1.1 Forward bearer establishment .......................................................... .......................................................... 206.1.1.1 MGW selection..................................................................................................................................... 206.1.1.2 Initial addressing ......................................................... .................................................................. ....... 206.1.1.3 Network side bearer establishment....................................................................................................... 206.1.1.4 Access bearer assignment..................................................................................................................... 206.1.1.5 Framing protocol initialisation ..................................................................... ........................................ 216.1.1.6 Confirmation of bearer establishment............................................................................................. 216.1.1.7 Through-Connection............................................................................................................................. 216.1.1.8 Interworking function........................................................................................................................... 216.1.1.9 Codec handling..................................................................................................................................... 216.1.1.10 Voice Processing function.................................................................................................................... 226.1.1.11 Failure handling in MSC server............................................................................................................ 226.1.1.12 Example................................................................................................................................................ 226.1.2 Backward bearer establishment.................................................................................................................. 246.1.2.1 MGW selection..................................................................................................................................... 246.1.2.2 Network side bearer establishment....................................................................................................... 246.1.2.3 Initial addressing ......................................................... .................................................................. ....... 246.1.2.4 Access bearer assignment..................................................................................................................... 256.1.2.5 Framing protocol initialisation ..................................................................... ........................................ 256.1.2.6 Confirmation of bearer establishment................................................................................................... 256.1.2.7 Through-Connection............................................................................................................................. 256.1.2.8 Interworking function........................................................................................................................... 256.1.2.9 Codec handling..................................................................................................................................... 266.1.2.10 Voice Processing function.................................................................................................................... 266.1.2.11 Failure handling in MSC server............................................................................................................ 266.1.2.12 Example................................................................................................................................................ 266.1.3 Originating Call Establishment For Iu Interface on IP............................................................................... 28


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6.1.4 Forward bearer establishment with Trace Session Activation ................................................................... 296.1.4.1 Trace activation ................................................................ .................................................................. 296.1.4.2 Example................................................................................................................................................ 306.2 Basic Mobile Terminating Call........................................................................................................................ 326.2.1 Forward bearer establishment .......................................................... .......................................................... 326.2.1.1 GMSC server........................................................................................................................................ 32

6.2.1.1.1 MGW selection ................................................................ ............................................................... 326.2.1.1.2 Initial addressing............................................................................................................................. 326.2.1.1.3 Outgoing side bearer establishment ........................................................... ..................................... 336.2.1.1.4 Incoming side bearer establishment................................................................................................ 336.2.1.1.5 Framing protocol initialisation........................................................................................................ 336.2.1.1.6 Through-Connection....................................................................................................................... 336.2.1.1.7 Confirmation of bearer establishment............................................................................................. 336.2.1.1.8 Voice Processing function ..................................................................... ......................................... 336.2.1.1.9 Failure handling in GMSC server .................................................................... ............................... 346.2.1.2 MSC server........................................................................................................................................... 346.2.1.2.1 Paging .................................................................... ................................................................... ...... 346.2.1.2.2 Call setup ............................................................... ................................................................. ........ 346.2.1.2.3 MGW selection ................................................................ ............................................................... 34

6.2.1.2.4 Network side bearer establishment ................................................................ ................................. 346.2.1.2.5 Access bearer assignment ................................................................ ............................................... 346.2.1.2.6 Framing protocol initialisation........................................................................................................ 356.2.1.2.7 Called party alerting........................................................................................................................ 356.2.1.2.8 Called party answer......................................................................................................................... 356.2.1.2.9 Through-Connection....................................................................................................................... 356.2.1.2.10 Interworking function ..................................................................... ................................................ 356.2.1.2.11 Codec handling .......................................................... ..................................................................... 366.2.1.2.12 Voice Processing function ..................................................................... ......................................... 366.2.1.2.13 Failure handling in MSC server...................................................................................................... 366.2.1.2.14 Example ...................................................................... .............................................................. ...... 366.2.2 Backward bearer establishment.................................................................................................................. 396.2.2.1 GMSC server........................................................................................................................................ 39

6.2.2.1.1 MGW selection ................................................................ ............................................................... 396.2.2.1.2 Outgoing side bearer establishment ........................................................... ..................................... 396.2.2.1.3 Initial addressing............................................................................................................................. 396.2.2.1.4 Incoming side bearer establishment................................................................................................ 396.2.2.1.5 Framing protocol initialisation........................................................................................................ 396.2.2.1.6 Through-Connection....................................................................................................................... 406.2.2.1.7 Confirmation of bearer establishment............................................................................................. 406.2.2.1.8 Voice Processing function ..................................................................... ......................................... 406.2.2.1.9 Failure handling in GMSC server .................................................................... ............................... 406.2.2.2 MSC server........................................................................................................................................... 406.2.2.2.1 Paging .................................................................... ................................................................... ...... 406.2.2.2.2 Call setup ............................................................... ................................................................. ........ 406.2.2.2.3 MGW selection ................................................................ ............................................................... 41

6.2.2.2.3 Network side bearer establishment ................................................................ ................................. 416.2.2.2.4 Access bearer assignment ................................................................ ............................................... 416.2.2.2.5 Framing protocol initialisation........................................................................................................ 416.2.2.2.6 Called party alerting........................................................................................................................ 426.2.2.2.7 Called party answer......................................................................................................................... 426.2.2.2.8 Through-Connection....................................................................................................................... 426.2.2.2.9 Interworking function ..................................................................... ................................................ 426.2.2.2.10 Codec handling .......................................................... ..................................................................... 426.2.2.2.11 Voice Processing function ..................................................................... ......................................... 426.2.2.2.12 Failure handling in MSC server...................................................................................................... 426.2.2.2.13 Example ...................................................................... .............................................................. ...... 426.2.3 Terminating Call Establishment For Iu Interface on IP .................................................................. ........... 46

7 Call Clearing ..........................................................................................................................................487.1 Network Initiated ............................................................ ................................................................ ................. 487.1.1 GMSC server.............................................................................................................................................. 487.1.1.1 Call clearing from the incoming side.................................................................................................... 48


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7.1.1.2 Call clearing to the outgoing side ......................................................................... ................................ 487.1.2 MSC server ............................................................. ................................................................. .................. 487.1.2.1 Call clearing from the network side...................................................................................................... 487.1.2.2 Call clearing to the UE ........................................................... .............................................................. 487.1.2.3 Example................................................................................................................................................ 497.2 User Initiated ....................................................... ................................................................ ............................ 50

7.2.1 Void............................................................................................................................................................ 517.2.2 MSC server ............................................................. ................................................................. .................. 517.2.2.1 all clearing from the UE ..................................................................... .................................................. 517.2.2.2 Call clearing to the network side ...................................................... .................................................... 517.2.2.3 Example................................................................................................................................................ 517.3 (G)MSC server Initiated ........................................................... ................................................................ ....... 527.3.1 GMSC server.............................................................................................................................................. 527.3.1.1 Call clearing to the destination side...................................................................................................... 527.3.1.2 Call clearing to the originating side...................................................................................................... 527.3.2 MSC server ............................................................. ................................................................. .................. 537.3.2.1 Call clearing to the UE ........................................................... .............................................................. 537.3.2.2 Call clearing to the network side ...................................................... .................................................... 537.3.2.3 Example................................................................................................................................................ 53

7.4 MGW Initiated................................................................................................................................................. 557.4.1 GMSC server.............................................................................................................................................. 557.4.1.1 Bearer released on the destination side................................................................................................. 557.4.1.2 Bearer released on the originating side................................................................................................. 557.4.2 MSC server ............................................................. ................................................................. .................. 557.4.2.1 Bearer released on the access side........................................................................... ............................. 557.4.2.2 Bearer released on the network side ..................................................................... ................................ 557.4.2.3 Example................................................................................................................................................ 557.5 Call Clearing for Iu Interface on IP ............................................................... .................................................. 57

8 Handover/Relocation..............................................................................................................................598.1 UMTS to UMTS............................................................. ................................................................ ................. 598.1.1 Intra-MSC SRNS/SBSS Relocation........................................................................................................... 598.1.1.1

Relocation Required ............................................................... .............................................................. 60

8.1.1.2 Relocation Command/Relocation Detect.............................................................................................. 608.1.1.3 Relocation Complete .................................................................. .......................................................... 608.1.1.4 Interworking function........................................................................................................................... 608.1.1.5 Codec handling..................................................................................................................................... 608.1.1.6 Voice Processing function.................................................................................................................... 608.1.1.7 Handling of multiple bearers (multicall) ....................................................................... ....................... 608.1.1.8 Failure Handling in MSC server........................................................................................................... 608.1.1.9 Example................................................................................................................................................ 608.1.2 Basic Inter-MSC SRNS/SBSS Relocation ........................................................................... ...................... 638.1.2.1 MSC-A/MGW-A.................................................................................................................................. 638.1.2.1.1 Relocation Required........................................................................................................................ 638.1.2.1.2 Bearer establishment between MGW-A and MGW-B.................................................................... 63

8.1.2.1.3 Relocation Command/Relocation Detect........................................................................................ 638.1.2.1.4 Relocation Complete....................................................................................................................... 638.1.2.1.5 Interworking function ..................................................................... ................................................ 638.1.2.1.6 Codec handling .......................................................... ..................................................................... 638.1.2.1.7 Voice Processing function ..................................................................... ......................................... 638.1.2.1.8 Handling of multiple bearers (multicall)......................................................................................... 648.1.2.1.9 Failure Handling in MSC server ............................................................................ ......................... 648.1.2.2 MSC-B/MGW-B .............................................................. .............................................................. ...... 648.1.2.2.1 MGW selection ................................................................ ............................................................... 648.1.2.2.2 Bearer establishment towards RNC-B ................................................................ ............................ 648.1.2.2.3 Bearer establishment between MGW-A and MGW-B.................................................................... 648.1.2.2.4 Codec handling .......................................................... ..................................................................... 648.1.2.2.5 Voice Processing function ..................................................................... ......................................... 64

8.1.2.2.6 Handling of multiple bearers (multicall)......................................................................................... 648.1.2.2.7 Failure Handling in MSC server ............................................................................ ......................... 648.1.2.2.8 Example ...................................................................... .............................................................. ...... 658.1.3 Subsequent Inter-MSC SRNS/SBSS Relocation back to the Anchor MSC............................................... 67


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8.1.3.1 MSC-A/MGW-A.................................................................................................................................. 678.1.3.1.1 Relocation Request ................................................................ ......................................................... 678.1.3.1.2 Relocation Command/Relocation Detect........................................................................................ 678.1.3.1.3 Relocation Complete....................................................................................................................... 688.1.3.1.4 Interworking function ..................................................................... ................................................ 688.1.3.1.5 Codec handling .......................................................... ..................................................................... 68

8.1.3.1.6 Voice Processing function ..................................................................... ......................................... 688.1.3.1.7 Handling of multiple bearers (multicall)......................................................................................... 688.1.3.1.8 Failure Handling in MSC server ............................................................................ ......................... 688.1.3.2 MSC-B/MGW-B .............................................................. .............................................................. ...... 688.1.3.2.1 Relocation Required........................................................................................................................ 688.1.3.2.2 Relocation Complete....................................................................................................................... 688.1.3.2.3 Release of bearer towards MGW-A................................................................................................ 688.1.3.2.4 Handling of multiple bearers (multicall)......................................................................................... 698.1.3.2.5 Example ...................................................................... .............................................................. ...... 698.1.4 Subsequent Inter-MSC SRNS/SBSS Relocation to a third MSC............................................................... 718.1.5 SRNS/SBSS Relocation with Iu on IP ............................................................. .......................................... 718.2 UMTS to GSM ............................................................ ................................................................... ................. 728.2.1 Intra-MSC UMTS to GSM Handover ......................................................................... ............................... 72

8.2.1.1 Relocation Required ............................................................... .............................................................. 728.2.1.2 Handover Request Acknowledge ............................................................. ............................................ 738.2.1.3 Relocation Command/Handover Detect ............................................................................ ................... 738.2.1.4 Handover Complete.............................................................................................................................. 738.2.1.5 Interworking function........................................................................................................................... 738.2.1.6 Voice Processing function.................................................................................................................... 738.2.1.7 Handling of multiple bearers (multicall) ....................................................................... ....................... 738.2.1.8 Failure Handling in MSC server........................................................................................................... 738.2.1.9 Example................................................................................................................................................ 738.2.2 Basic Inter-MSC UMTS to GSM Handover ................................................................... ........................... 768.2.2.1 MSC-A/ MGW-A................................................................................................................................. 768.2.2.1.1 Bearer establishment between MGW-A and MGW-B.................................................................... 768.2.2.1.2 Relocation Command/Handover Detect ..................................................................... .................... 76

8.2.2.1.3 Handover Complete ............................................................... ......................................................... 768.2.2.1.4 Interworking function ..................................................................... ................................................ 768.2.2.1.5 Voice Processing function ..................................................................... ......................................... 778.2.2.1.6 Handling of multiple bearers (multicall)......................................................................................... 778.2.2.1.7 Failure Handling in MSC server ............................................................................ ......................... 778.2.2.2 MSC-B/MGW-B .............................................................. .............................................................. ...... 778.2.2.2.1 MGW selection ................................................................ ............................................................... 778.2.2.2.2 Bearer establishment towards BSC-B............................................................................................. 778.2.2.2.3 Bearer establishment between MGW-A and MGW-B.................................................................... 778.2.2.2.4 Voice Processing function ..................................................................... ......................................... 778.2.2.2.5 Failure Handling in MSC server ............................................................................ ......................... 778.2.2.2.6 Example ...................................................................... .............................................................. ...... 778.2.3 Subsequent Inter-MSC UMTS to GSM Handover back to the Anchor MSC............................................ 80

8.2.3.1 MSC-A ............................................................... ................................................................. ................. 818.2.3.1.1 Handover Request........................................................................................................................... 818.2.3.1.2 Handover Request Acknowledge.................................................................................................... 818.2.3.1.3 Relocation Command/Handover Detect ..................................................................... .................... 818.2.3.1.4 Handover Complete ............................................................... ......................................................... 818.2.3.1.5 Interworking function ..................................................................... ................................................ 818.2.3.1.6 Voice Processing function ..................................................................... ......................................... 818.2.3.1.7 Handling of multiple bearers (multicall)......................................................................................... 818.2.3.1.8 Failure Handling in MSC server ............................................................................ ......................... 818.2.3.2 MSC-B.................................................................................................................................................. 818.2.3.2.1 Handover Complete ............................................................... ......................................................... 818.2.3.2.2 Release of bearer towards MGW-A................................................................................................ 828.2.3.2.3 Handling of multiple bearers (multicall)......................................................................................... 82

8.2.3.2.4 Example ...................................................................... .............................................................. ...... 838.2.4 Subsequent Inter-MSC UMTS to GSM Handover to a third MSC............................................................ 868.3 GSM to UMTS .............................................................. ................................................................. ................. 868.3.1 Intra-MSC GSM to UMTS Handover........................................................................................................ 86


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8.3.1.1 Handover Required............................................................................................................................... 868.3.1.2 Handover Command/Relocation Detect ................................................................. .............................. 868.3.1.3 Relocation Complete .................................................................. .......................................................... 868.3.1.4 Interworking function........................................................................................................................... 868.3.1.5 Codec handling..................................................................................................................................... 878.3.1.6 Voice Processing function.................................................................................................................... 87

8.3.1.7 Failure Handling in MSC server........................................................................................................... 878.3.1.8 Example................................................................................................................................................ 878.3.2 Basic Inter-MSC GSM to UMTS Handover ................................................................ .............................. 898.3.2.1 MSC-A ............................................................... ................................................................. ................. 908.3.2.1.1 Handover Required ................................................................ ......................................................... 908.3.2.1.2 Bearer establishment between MGW-A and MGW-B.................................................................... 908.3.2.1.3 Handover Command/Handover Detect........................................................................................... 908.3.2.1.4 Handover Complete ............................................................... ......................................................... 908.3.2.1.5 Interworking function ..................................................................... ................................................ 908.3.2.1.6 Codec handling .......................................................... ..................................................................... 908.3.2.1.7 Voice Processing function ..................................................................... ......................................... 908.3.2.1.8 Failure Handling in MSC server ............................................................................ ......................... 918.3.2.2 MSC-B.................................................................................................................................................. 91

8.3.2.2.1 MGW selection ................................................................ ............................................................... 918.3.2.2.2 Bearer establishment towards RNC-B ................................................................ ............................ 918.3.2.2.3 Bearer establishment between MGW-A and MGW-B.................................................................... 918.3.2.2.4 Codec handling .......................................................... ..................................................................... 918.3.2.2.5 Voice Processing function ..................................................................... ......................................... 918.3.2.2.6 Failure Handling in MSC server ............................................................................ ......................... 918.3.2.2.7 Example ...................................................................... .............................................................. ...... 928.3.3 Subsequent Inter-MSC GSM to UMTS Handover back to the Anchor MSC............................................ 948.3.3.1 MSC-A ............................................................... ................................................................. ................. 948.3.3.1.1 Handover Request........................................................................................................................... 948.3.3.1.2 Handover Command/Relocation Detect ...................................................................... ................... 958.3.3.1.3 Relocation Complete....................................................................................................................... 958.3.3.1.4 Interworking function ..................................................................... ................................................ 95

8.3.3.1.5 Codec handling .......................................................... ..................................................................... 958.3.3.1.6 Voice Processing function ..................................................................... ......................................... 958.3.3.1.7 Failure Handling in MSC server ............................................................................ ......................... 958.3.3.2 MSC-B / MGW-B ............................................................ .............................................................. ...... 958.3.3.2.1 Handover Required ................................................................ ......................................................... 958.3.3.2.2 Handover Complete ............................................................... ......................................................... 968.3.3.2.3 Release of bearer towards MGW-A................................................................................................ 968.3.3.2.4 Example ...................................................................... .............................................................. ...... 968.3.4 Subsequent Inter-MSC GSM to UMTS Handover to a third MSC............................................................ 988.3.5 GSM to UMTS Handover with Iu on IP ..................................................................... ............................... 998.4 GSM to GSM................................................................................................................................................. 1008.4.1 Intra-MSC GSM to GSM Handover ....................................................................... ................................. 1008.4.1.1 Handover Required............................................................................................................................. 100

8.4.1.2 Handover Request Acknowledge ............................................................. .......................................... 1018.4.1.3 Handover Command/Handover Detect............................................................................................... 1018.4.1.4 Handover Complete............................................................................................................................ 1018.4.1.5 Interworking function......................................................................................................................... 1018.4.1.6 Voice Processing function.................................................................................................................. 1018.4.1.7 Failure Handling in MSC server......................................................................................................... 1018.4.1.8 Example.............................................................................................................................................. 1028.4.2 Basi ............................................................... ................................................................. .......................... 104c Inter-MSC GSM to GSM Handover .................................................................... ........................................................ 1048.4.2.1 MSC-A / MGW-A.............................................................................................................................. 1048.4.2.1.1 Bearer establishment between MGW-A and MGW-B.................................................................. 1048.4.2.1.2 Handover Command/Handover Detect......................................................................................... 1048.4.2.1.3 Handover Complete ............................................................... ....................................................... 104

8.4.2.1.4 Interworking function ..................................................................... .............................................. 1048.4.2.1.5 Voice Processing function ..................................................................... ....................................... 1058.4.2.1.6 Failure Handling in MSC server ............................................................................ ....................... 1058.4.2.2 MSC-B / MGW-B ............................................................ .............................................................. .... 105


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8.4.2.2.1 MGW selection ................................................................ ............................................................. 1058.4.2.2.2 Bearer establishment towards BSC-B........................................................................................... 1058.4.2.2.3 Bearer establishment between MGW-A and MGW-B.................................................................. 1058.4.2.2.4 Voice Processing function ..................................................................... ....................................... 1058.4.2.2.5 Failure Handling in MSC server ............................................................................ ....................... 1058.4.2.2.6 Example ...................................................................... .............................................................. .... 105

8.4.3 Subsequent Inter-MSC GSM to GSM Handover back to the Anchor MSC............................................. 1088.4.3.1 MSC-A / MGW-A.............................................................................................................................. 1088.4.3.1.1 Handover Request Acknowledge.................................................................................................. 1098.4.3.1.2 Handover Command/Handover Detect......................................................................................... 1098.4.3.1.3 Handover Complete ............................................................... ....................................................... 1098.4.3.1.4 Interworking function ..................................................................... .............................................. 1098.4.3.1.5 Voice Processing function ..................................................................... ....................................... 1098.4.3.1.6 Failure Handling in MSC server ............................................................................ ....................... 1098.4.3.2 MSC-B/MGW-B .............................................................. .............................................................. .... 1098.4.3.2.1 Handover Complete ............................................................... ....................................................... 1098.4.3.2.2 Release of bearer towards MGW-A.............................................................................................. 1098.4.3.2.3 Example ...................................................................... .............................................................. .... 1108.4.4 Subsequent GSM to GSM Handover to a third MSC............................................................................... 112

8.5 Handling of GSM Services after UMTS to GSM Handover ........................................................................ . 1139 Compatibility Issues .............................................................................................................................1139.1 Interworking with GERAN (A i/f)................................................................................................................. 113

10 General (G)MSC server-MGW Procedures .........................................................................................11410.1 MGW Unavailable......................................................................................................................................... 11410.2 MGW Available............................................................................................................................................. 11510.3 MGW Recovery............................................................................................................................................. 11610.4 (G)MSC server Recovery ............................................................ .................................................................. 11710.4.1 General..................................................................................................................................................... 11710.4.2 (G)MSC Server Restoration..................................................................................................................... 11710.5 MGW Re-register ................................................................ ..................................................................... ..... 11710.6 MGW Re-registration Ordered by (G)MSC server........................................................................................ 118

10.7 Removal from Service of a Physical Termination............................................................ ............................. 11810.8 Restoration to Service of a Physical Termination.......................................................................................... 11910.9 Audit of MGW............................................................................................................................................... 11910.9.1 Audit of Value.......................................................................................................................................... 11910.9.2 Audit of Capability................................................................................................................................... 12010.10 MGW Capability Change ........................................................ .................................................................. .... 12010.11 Void ............................................................. .............................................................. .................................... 12110.12 (G)MSC Server Out of service ........................................................................ .............................................. 12110.13 MGW Resource Congestion Handling - Activate.......................................................................................... 12110.14 MGW Resource Congestion Handling -Indication........................................................................................ 121

11 Identities...............................................................................................................................................12211.1 Bearer Address and Binding Reference ....................................................................... .................................. 122

11.2 MGW-Id .................................................................. ............................................................ .......................... 12211.3 (G)MSC server Address................................................................................................................................. 122

12 Operational Aspects .............................................................................................................................12212.1 Charging ..................................................................... .................................................................... ............... 122

13 Interactions with Other Services ..........................................................................................................12213.1 Enhanced Multi-Level Precedence and Pre-emption service (eMLPP)......................................................... 12213.2 Call Deflection Service.................................................................................................................................. 12213.2.1 MGW selection and incoming side bearer establishment .................................................................. ...... 12213.2.2 IU/A-interface release ..................................................................... ......................................................... 12313.2.3 Notification to the Calling Subscriber...................................................................................................... 12313.2.4 Initial addressing ............................................................... .................................................................. ..... 12313.2.5 Establishment of bearer towards the forwarded-to subscriber ................................................................. 12313.2.6 Failure handling in MSC server ................................................................ ............................................... 12313.2.7 Example .......................................................... ............................................................... .......................... 12313.3 Line identification Services ............................................................................ ............................................... 12413.3.1 Calling Line Identification Presentation (CLIP) ................................................................... ................... 124


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3GPP TS 23.205 V6.9.0 (2008-03)9Release 6

13.3.2 Calling Line Identification Restriction (CLIR) ..................................................................... ................... 12413.3.3 Connected Line Identification Presentation (COLP)................................................................................ 12413.3.4 Connected Line Identification Restriction (COLR) ................................................................. ................ 12513.4 Call Forwarding Services............................................................................................................................... 12513.4.1 Call Forwarding Unconditional (CFU) ............................................................. ....................................... 12513.4.1.1 MGW selection................................................................................................................................... 125

13.4.1.2 Incoming side bearer establishment.................................................................................................... 12513.4.1.3 Notification to the Calling Subscriber ........................................................................... ..................... 12513.4.1.4 Initial addressing ......................................................... .................................................................. ..... 12513.4.1.5 Establishment of bearer towards the forwarded-to subscriber............................................................ 12513.4.1.6 Confirmation of bearer establishment................................................................................................. 12513.4.1.7 Failure handling in GMSC server....................................................................................................... 12513.4.1.8 Example.............................................................................................................................................. 12613.4.2 Call Forwarding on mobile subscriber Busy (CFB)................................................................................. 12613.4.2.1 Network Determined User Busy (NDUB).......................................................................................... 12713.4.2.1.1 MGW selection ................................................................ ............................................................. 12713.4.2.1.2 Incoming side bearer establishment.............................................................................................. 12713.4.2.1.3 Notification to the calling subscriber .............................................................. .............................. 12713.4.2.1.4 Initial addressing........................................................................................................................... 127

13.4.2.1.5 Establishment of bearer towards the forwarded-to subscriber ...................................................... 12713.4.2.1.5 Confirmation of bearer establishment........................................................................................... 12813.4.2.1.6 Failure handling in MSC server.................................................................................................... 12813.4.2.1.7 Example ...................................................................... .............................................................. .... 12813.4.2.2 User Determined User Busy (UDUB)....................................................................... ......................... 12913.4.2.2.1 MGW selection ................................................................ ............................................................. 12913.4.2.2.2 Incoming side bearer establishment.............................................................................................. 12913.4.2.2.3 IU/A-interface release................................................................................................................... 13013.4.2.2.4 Notification to the Calling Subscriber........................................................................................... 13013.4.2.2.5 Initial addressing........................................................................................................................... 13013.4.2.2.6 Establishment of bearer towards the forwarded-to subscriber ...................................................... 13013.4.2.2.7 Confirmation of bearer establishment........................................................................................... 13013.4.2.2.8 Failure handling in MSC server.................................................................................................... 130

13.4.2.2.9 Example ...................................................................... .............................................................. .... 13113.4.3 Call Forwarding on No Reply (CFNRy)..................................................................... ............................. 13213.4.3.1 MGW selection and incoming side bearer establishment................................................................... 13213.4.6.2 IU/A-interface release......................................................................................................................... 13213.4.6.3 Notification to the Calling Subscriber ........................................................................... ..................... 13213.4.6.4 Initial addressing ......................................................... .................................................................. ..... 13313.4.6.5 Establishment of bearer towards the forwarded-to subscriber............................................................ 13313.4.6.6 Failure handling in MSC server.......................................................................................................... 13313.4.6.7 Example.............................................................................................................................................. 13313.4.4 Call Forwarding on mobile subscriber Not Reachable (CFNRc)............................................................. 13413.4.4.1 Rerouting by HLR ....................................................... ................................................................... .... 13413.4.4.2 Rerouting by VLR ....................................................... ................................................................... .... 13413.4.4.2.1 MGW selection ................................................................ ............................................................. 135

13.4.4.2.2 Incoming side bearer establishment.............................................................................................. 13513.4.4.2.3 Notification to the calling subscriber .............................................................. .............................. 13513.4.4.2.4 Initial addressing........................................................................................................................... 13513.4.4.2.5 Establishment of bearer towards the forwarded-to subscriber ...................................................... 13513.4.4.2.6 Confirmation of bearer establishment........................................................................................... 13613.4.4.2.7 Failure handling in MSC server.................................................................................................... 13613.4.4.2.8 Example ...................................................................... .............................................................. .... 13613.5 Call Waiting (CW)......................................................................................................................................... 13713.5.1 Call Confirmation of the waiting call....................................................................................................... 13913.5.2 Acceptance of the Waiting Call................................................................................................................ 14013.6 Call Hold (CH) ...................................................... ............................................................... ......................... 14013.6.1 Hold request ......................................................... .................................................................... ................ 14013.6.2 Retrieval request....................................................................................................................................... 141

13.6.3 Setting up another call.............................................................................................................................. 14113.6.4 Alternate from one call to the other.......................................................................................................... 14113.6.5 Disconnect................................................................................................................................................ 14113.6.6 Failure handling in MSC server ................................................................ ............................................... 141


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3GPP TS 23.205 V6.9.0 (2008-03)10Release 6

13.6.7 Example 1 ................................................................. ............................................................... ................ 14113.6.8 Example 2 ................................................................. ............................................................... ................ 14413.7 Multiparty (MPTY)........................................................................................................................................ 14713.7.1 Beginning the Multi Party call ................................................................ ................................................. 14713.7.2 Managing an active Multi Party call .................................................................... .................................... 14713.7.3 Disconnect................................................................................................................................................ 148

13.7.4 Failure handling in MSC server ................................................................ ............................................... 14813.7.5 Example 1 ................................................................. ............................................................... ................ 14813.7.6 Void.......................................................................................................................................................... 14913.8 Closed User Group (CUG)............................................................................................................................. 14913.9 Advice of Charge (AoC)................................................................................................................................ 14913.10 User-to-User Signalling (UUS)...................................................................................................................... 14913.11 Call Barring Services..................................................................................................................................... 15013.11.1 Barring of outgoing calls.......................................................................................................................... 15013.11.2 Barring of incoming calls......................................................................................................................... 15013.12 Explicit Call Transfer (ECT) ............................................................... .......................................................... 15013.12.1 Connection of remote parties ........................................................... ........................................................ 15013.12.2 IU/A-interface release ..................................................................... ......................................................... 15013.12.3 Failure handling in MSC server ................................................................ ............................................... 150

13.12.4 Example .......................................................... ............................................................... .......................... 15113.13 Completion of Calls to Busy Subscriber (CCBS)...................................................................... .................... 15313.13.1 Clearing when tones/announcements are provided to the calling subscriber ........................................... 15313.13.2 Network initiated mobile originated call.................................................................................................. 15313.13.2.1 Early Traffic Channel Assignment .............................................................. ....................................... 15413.13.2.1.1 Example ...................................................................... .............................................................. .... 15413.13.3 CCBS Information conveyed by Call Signalling ..................................................................... ................ 15513.14 Multiple Subscriber Profile (MSP) ............................................................. ................................................... 15513.15 Multicall......................................................................................................................................................... 15513.15.1 Mobile Originating................................................................................................................................... 15513.15.2 Mobile Terminating .................................................................. ............................................................... 15513.16 Calling Name Presentation (CNAP) .......................................................................... .................................... 15513.17 Alternate Speech/Fax..................................................................................................................................... 155

13.18 Modification of the Access Bearer................................................................................................................. 15613.18.1 Modification of Bearer Characteristics .................................................................... ................................ 15613.18.1.1 Iu mode............................................................................................................................................... 15613.18.1.2 A/Gb mode .......................................................... ................................................................ ............... 15613.18.2 IWF Protocol Change............................................................................................................................... 15613.19 GSM Fax........................................................................................................................................................ 156

14 Interactions with Other Network Features and Services ......................................................................15714.1 Customised Applications for Mobile network Enhanced Logic (CAMEL)................................................... 15714.1.1 Play Announcement/Send Tone .......................................................................... ..................................... 15814.1.1.1 Example of playing announcement by the gsmSRF ......................................................................... .. 15814.1.2 User Interaction........................................................................................................................................ 15814.1.2.1 Play announcement............................................................................................................................. 158

14.1.2.2 Detect DTMF tones ............................................................... ............................................................. 15814.1.2.3 Report DTMF tones............................................................................................................................ 15814.1.2.4 Cancel prompt and collect user information....................................................................................... 15914.1.3 Call Party Handling (CPH) ............................................................. ......................................................... 15914.1.3.1 Call Party Handling concepts ............................................................... .............................................. 15914.1.3.2 Initiate Call Attempt procedure ................................................................. ......................................... 16014.1.3.2.1 Example ...................................................................... .............................................................. .... 16014.1.3.3 Move Leg procedure........................................................................................................................... 16114.1.3.4 Split Leg procedure ................................................................ ............................................................ 16214.1.3.5 CAMEL User interaction procedure................................................................................................... 16314.1.3.6 Failure handling in the MSC-S........................................................................................................... 16414.2 IST ............................................................. ............................................................... ..................................... 16414.3 Operator Determined Barring (ODB) ................................................................. ........................................... 164

14.3.1 Barring of Outgoing Calls .................................................................... .................................................... 16414.3.2 Barring of Incoming Calls........................................................................................................................ 16414.4 DTMF .................................................................... .............................................................. .......................... 16514.4.1 DTMF Tone Generation........................................................................................................................... 165


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3GPP TS 23.205 V6.9.0 (2008-03)11Release 6

14.4.1.1 Inband DTMF Tone Generation ................................................................... ...................................... 16514.4.1.1.1 Start DTMF................................................................................................................................... 16514.4.1.1.2 Stop DTMF................................................................................................................................... 16514.4.1.1.3 Example ...................................................................... .............................................................. .... 16514.4.1.2 Out-of-Band DTMF Tone Generation................................................................................................ 16614.4.1.2.1 Start DTMF................................................................................................................................... 166

14.4.1.2.2 Stop DTMF................................................................................................................................... 16614.4.1.2.3 Example ...................................................................... .............................................................. .... 16614.4.2 DTMF Detection .............................................................. .................................................................... .... 16714.4.2.1 Inband DTMF Detection ............................................................. ....................................................... 16714.4.2.2 Out-of-Band DTMF Detection .................................................................. ......................................... 16814.5 OR.................................................................................................................................................................. 16814.5.1 Optimal routeing for basic mobile-to-mobile calls................................................................................... 16814.5.2 Optimal routeing for conditional call forwarding; Early call forwarding ................................................ 16814.5.3 Optimal routeing for conditional call forwarding; Late call forwarding .................................................. 16814.5.3.1 MSC server......................................................................................................................................... 16814.5.3.1.1 Resume Call Handling and clearing of connection to GMSC server............................................ 16814.5.3.1.2 IU release .............................................................. ................................................................... ..... 16814.5.3.2 GMSC server...................................................................................................................................... 169

14.5.3.2.1 Resume Call Handling and Clearing of Connection to visited MSC server ................................. 16914.5.3.2.2 MGW selection ................................................................ ............................................................. 16914.5.3.2.3 Incoming side bearer establishment.............................................................................................. 16914.5.3.2.4 Notification to the Calling Subscriber........................................................................................... 16914.5.3.2.5 Establishment of call and bearer towards the forwarded-to subscriber......................................... 16914.5.3.2.6 Example ...................................................................... .............................................................. .... 16914.6 Providing tones or announcements .................................................................. .............................................. 17314.6.1 Preconditions when providing in-band information to the calling subscriber.......................................... 17314.6.2 Preconditions when providing in-band information to the called subscriber ........................................... 17314.6.3 Preconditions when providing in-band information to multiple subscribers............................................ 17314.6.4 Request to play an announcement/tone.................................................................................................... 17314.6.5 Stopping an announcement/tone .................................................................... .......................................... 17314.6.6 Announcement/tone completed................................................................................................................ 174

14.6.7 Example .......................................................... ............................................................... .......................... 17414.7 Global Text Telephony ............................................................. ................................................................. .... 17514.8 Emergency Calls............................................................................................................................................ 17514.9 Subscriber and equipment trace..................................................................................................................... 175

15 Tunnelling ............................................................................................................................................17515.1 Forward Bearer Establishment....................................................................................................................... 17515.1.1 Outgoing Side .......................................................... ................................................................. ............... 17615.1.1.1 Tunnel Selection................................................................................................................................. 17615.1.1.2 Initial addressing ......................................................... .................................................................. ..... 17615.1.1.3 Fast forward tunnelling....................................................................................................................... 17615.1.1.4 Delayed forward tunnelling................................................................................................................ 17615.1.1.5 Bearer control signalling transfer ......................................................................... .............................. 177

15.1.2 Incoming Side ............................................................. .............................................................. ............... 17715.1.2.1 Initial addressing ......................................................... .................................................................. ..... 17715.1.2.2 Tunnel Selection................................................................................................................................. 17715.1.2.3 Fast forward tunnelling....................................................................................................................... 17715.1.2.4 Delayed forward tunnelling................................................................................................................ 17715.1.2.5 Bearer control signalling transfer ......................................................................... .............................. 17815.1.2.6 Example.............................................................................................................................................. 17815.2 Backward Bearer Establishment .................................................................. .................................................. 17915.2.1 Outgoing Side .......................................................... ................................................................. ............... 17915.2.1.1 Tunnel Selection................................................................................................................................. 17915.2.1.2 Initial addressing ......................................................... .................................................................. ..... 18015.2.1.3 Fast forward tunnelling....................................................................................................................... 18015.2.1.4 Delayed backward tunnelling ................................................................... .......................................... 180

15.2.1.5 Bearer control signalling transfer ......................................................................... .............................. 18015.2.2 Incoming Side ............................................................. .............................................................. ............... 18015.2.2.1 Initial addressing ......................................................... .................................................................. ..... 18015.2.2.2 Tunnel Selection................................................................................................................................. 180


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15.2.2.3 Fast forward tunnelling....................................................................................................................... 18015.2.2.4 Delayed backward tunnelling ................................................................... .......................................... 18115.2.2.5 Bearer control signalling transfer ......................................................................... .............................. 18115.2.2.6 Example.............................................................................................................................................. 181

16 Messages/Procedures and their contents ..............................................................................................18216.1 Messages between (G)MSC servers ............................................................... ............................................... 18216.2 Procedures between (G)MSC server and MGW............................................................................................ 18416.2.1 Change Flow Direction ............................................................. ............................................................... 18416.2.2 Join Bearer Termination........................................................................................................................... 18416.2.3 Isolate Bearer Termination....................................................................................................................... 18516.2.4 Establish Bearer ................................................................. .................................................................. .... 18616.2.5 Prepare Bearer.......................................................................................................................................... 18816.2.6 Reserve Circuit......................................................................................................................................... 19016.2.7 Change Through-Connection ..................................................................... .............................................. 19016.2.8 Activate Interworking Function ........................................................... .................................................... 19116.2.9 Release Bearer.......................................................................................................................................... 19116.2.10 Bearer Established.................................................................................................................................... 19216.2.11 Bearer Released........................................................................................................................................ 19216.2.12 Release Termination................................................................................................................................. 19316.2.13 Tunnel Information Up ............................................................. ............................................................... 19316.2.14 Tunnel Information Down........................................................................................................................ 19416.2.15 Send Tone .............................................................. .................................................................... .............. 19416.2.16 Stop Tone ............................................................... ................................................................... ............... 19516.2.17 Play Announcement ......................................................... ................................................................... ..... 19516.2.18 Stop Announcement .................................................................. ............................................................... 19616.2.19 Announcement Completed....................................................................................................................... 19616.2.20 Tone Completed....................................................................................................................................... 19716.2.21 Detect DTMF ............................................................. ............................................................... ............... 19716.2.22 Stop DTMF Detection..........................................................................

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