CVOICE 6.0 S03 L02

© 2008 Cisco Systems, Inc. All rights reserved. CVOICE v6.0—3-1

Implementing VoIP Gateways

Implementing MGCP Gateways


MGCP Components

Defined in RFC 3435 which obsoletes RFC 2705

Architecture and requirements defined in RFC 2805

Centralized device control with simple endpoints for basic and enhanced telephony services

An extension of the Simple Gateway Control Protocol (SGCP) protocol and supports SGCP functionality in addition to several enhancements

Allows remote control of various devices

Stimulus protocol

Endpoints and gateways cannot function alone

Uses IETF SDP

Addressing by E.164 telephone number


Why MGCP

Advantages of MGCP gateways: Alternative dial tone for VoIP environments

Simplified configuration for VoIP dial peers

Simplified migration

Centralized dial plan configuration on the Cisco Unified Communications Manager

Centralized gateway configuration on the Cisco Unified Communications Manager

Simplified Cisco IOS configuration

Supports QSIG supplementary services with Cisco Unified Communications Manager


MGCP Components

Call Agent (MGCP)

IPPRIPRI

PSTN

Residential Gateway Connecting POTS phones

to an IP network

Trunking Gateway Connecting PSTN-bearer

channels to an IP network

FXS*

Cisco Unified Communications

Manager

Cisco Voice Gateways

FXS = Foreign Exchange Station


MGCP Gateways

Call processing is done by a call agent such as Cisco Unified Communications Manager.

Calls are routed via route patterns on the Cisco Unified Communications Manager, not by dial peers on the gateway.

Supported Gateways

– Residential gateway

– Trunking gateway


MGCP Gateways (Cont.)

MGCP uses endpoints and connections to construct a call.

– Endpoints:

Sources of or destinations for data

Physical or logical locations in a device

– Connections:

Point-to-point

Multipoint

MGCP uses UDP for establishing audio connections over IP networks.


Call Agents

Call Agent

GatewayGateway

IP


Basic MGCP Concepts

Calls and connections

Events and signals

Package types


Create Connection (CRCX)

Create Connection (CRCX)

Modify Connection (MDCX)

User Information Exchange

Delete Connection (DLCX)

Delete ACKDelete Connection (DLCX)

Delete ACK

Calls and Connections


Control Commands

AuditEndpoint (AUEP)

AuditConnection (AUCX)

CreateConnection (CRCX)

ModifyConnection (MDCX)

DeleteConnection (DLCX)

NotificationRequest (RQNT)

Notify (NTFY)

RestartInProgress (RSIP)


Package Types

Enable with the mgcp package-capability command:

– Trunk

– Line

– Dual-tone multifrequency (DTMF)

– Generic media

– Real-Time Transport Protocol (RTP)

– Announcement server

– Script


Call FlowsCall

Agent

Gateway A Gateway B

Ringing,Then Answer

Off Hook andDialed 5551234

On Hook

RQNT RQNT

RQNT ResponseRQNT Response

NTFY

CRCX

CRCX Response

(SDP)MDCX (Encapsulated

RQNT, SDP)

MDCX Response

DLCX

DLCX Response

NTFY

DLCX

CRCX (SDP,Encapsulated

RQNT)

CRCX

Response (SDP)

DLCX Response

RTP StreamRTP Stream

RTCP Stream


Configuring MGCP Gateways

Residential gateway

– Dial peer configuration

Trunking gateway

– Controller configuration


Configuring an MGCP Residential Gateway

Residential Gateway

Cisco Unified Call

Manager172.20.5.20

IP

router(config)# ccm-manager mgcprouter(config)# mgcprouter(config-mgcp)# mgcp call-agent 172.20.5.20 service-type mgcprouter(config)# dial-peer voice 1 potsrouter(config-dialpeer)# service mgcpapprouter(config-dialpeer)# port 1/0/0router(config)# dial-peer voice 2 potsrouter(config-dialpeer)# service mgcpapprouter(config-dialpeer)# port 1/0/1router(config-dialpeer)# exitrouter(config)# mgcp package-capability dtmf-packagerouter(config)# mgcp package-capability gm-packagerouter(config)# mgcp package-capability line-packagerouter(config)# mgcp package-capability rtp-packagerouter(config)# mgcp default-package line-package

1/0/0

1/0/1


Configuring an MGCP Trunk Gateway

router(config)# ccm-manager mgcprouter(config)# mgcp 4000router(config)# mgcp call-agent 10.1.1.201 4000router(config)# controller t1 0/1/0router(config-controller)# framing esfrouter(config-controller)# clock source internalrouter(config-controller)# ds0-group 1 timeslots 1-24 type none service mgcprouter(config)# controller t1 0/1/1router(config-controller)# framing esfrouter(config-controller)# clock source internalrouter(config-controller)# ds0-group 1 timeslots 1-24 type none service mgcp

MGCP Gateway

Cisco Unified Call Manager 10.1.1.201

PSTNIP Phones

WAN


IP Network

G3 Fax G3 Fax

T.38 Gateway

T.38 Gateway

Router(config)# ccm-manager mgcpRouter(config)# no ccm-manager fax protocol ciscoRouter(config)# mgcpRouter(config)# mgcp call-agent 10.1.1.10 service-type mgcp version 0.1Router(config)# mgcp package-capability fxr-packageRouter(config)# mgcp package-capability rtp-packageRouter(config)# mgcp fax rate 14400Router(config)# mgcp timer 300Router(config)# mgcp fax-relay sg3-to-g3

Cisco Unified Call Manager Cisco

Unified Call Manager

San Jose Austin

10.1.1.10

Configuring Fax Pass-Through and Relay with MGCP Gateways


router# show mgcp MGCP Admin State ACTIVE, Oper State ACTIVE - Cause Code NONEMGCP call-agent: 10.1.1.101 4000 Initial protocol service is MGCP 0.1MGCP validate call-agent source-ipaddr DISABLEDMGCP validate domain name DISABLEDMGCP block-newcalls DISABLEDMGCP send SGCP RSIP: forced/restart/graceful/disconnected DISABLED MGCP quarantine mode discard/stepMGCP quarantine of persistent events is ENABLEDMGCP dtmf-relay for VoIP is SDP controlledMGCP dtmf-relay for voAAL2 is SDP controlledMGCP voip modem passthrough disabledMGCP voaal2 modem passthrough disabledMGCP voip tremolo modem relay: DisabledMGCP T.38 Named Signalling Event (NSE) response timer: 200MGCP Network (IP/AAL2) Continuity Test timer: 200MGCP 'RTP stream loss' timer: 5MGCP request timeout 500MGCP maximum exponential request timeout 4000MGCP gateway port: 4000, MGCP maximum waiting delay 3000

Verifying MGCP


MGCP restart delay 0, MGCP vad DISABLEDMGCP rtrcac DISABLEDMGCP system resource check DISABLEDMGCP xpc-codec: DISABLED, MGCP persistent hookflash: DISABLEDMGCP persistent offhook: ENABLED, MGCP persistent onhook: DISABLEDMGCP piggyback msg ENABLED, MGCP endpoint offset DISABLEDMGCP simple-sdp DISABLEDMGCP undotted-notation DISABLEDMGCP codec type g711ulaw, MGCP packetization period 20MGCP JB threshold lwm 30, MGCP JB threshold hwm 150MGCP LAT threshold lwm 150, MGCP LAT threshold hwm 300MGCP PL threshold lwm 1000, MGCP PL threshold hwm 10000MGCP CL threshold lwm 1000, MGCP CL threshold hwm 10000MGCP playout mode is adaptive 60, 40, 200 in msecMGCP Fax Playout Buffer is 300 in msecMGCP media (RTP) dscp: ef, MGCP signaling dscp: af31MGCP default package: trunk-packageMGCP supported packages: gm-package dtmf-package trunk-package line-package hs-package atm-package ms-package dt-package mo-package

res-package mt-package fxr-package md-package MGCP Digit Map matching order: shortest matchSGCP Digit Map matching order: always left-to-rightMGCP VoAAL2 ignore-lco-codec DISABLED

Verifying MGCP (Cont.)



MGCP T.38 Max Fax Rate is DEFAULTMGCP T.38 Fax is ENABLEDMGCP T.38 Fax ECM is ENABLEDMGCP T.38 Fax NSF Override is DISABLEDMGCP T.38 Fax Low Speed Redundancy: 0MGCP T.38 Fax High Speed Redundancy: 0MGCP Fax relay SG3-to-G3: ENABLEDMGCP control bind :DISABLEDMGCP media bind :DISABLEDMGCP Upspeed payload type for G711ulaw: 0, G711alaw: 8MGCP Dynamic payload type for G.726-16K codecMGCP Dynamic payload type for G.726-24K codecMGCP Dynamic payload type for G.Clear codecMGCP Dynamic payload type for NSE is 100MGCP Dynamic payload type for NTE is 99MGCP rsip-range is enabled for TGCP only.MGCP Guaranteed scheduler time is disabledMGCP DNS stale threshold is 30 seconds


router# show ccm-managerMGCP Domain Name: cisco-voice-01Priority Status Host============================================================Primary Registered 10.89.129.211First Backup NoneSecond Backup None

Current active Call Manager: 10.89.129.211Backhaul/Redundant link port: 2428Failover Interval: 30 secondsKeepalive Interval: 15 secondsLast keepalive sent: 5w1d (elapsed time: 00:00:04)Last MGCP traffic time: 5w1d (elapsed time: 00:00:04)Last failover time: NoneSwitchback mode: GracefulMGCP Fallback mode: Not SelectedLast MGCP Fallback start time: 00:00:00Last MGCP Fallback end time: 00:00:00

Configuration Error History:




router# show mgcp endpoint

Interface T1 0/1/0

ENDPOINT-NAME V-PORT SIG-TYPE ADMIN S0/SU1/ds1-0/1@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/2@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/3@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/4@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/5@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/6@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/7@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/8@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/9@HQ-1 0/1/0:1 none up S0/SU1/ds1-0/10@HQ-1 0/1/0:1 none up



router# show mgcp statistics

UDP pkts rx 8, tx 9Unrecognized rx pkts 0, MGCP message parsing errors 0Duplicate MGCP ack tx 0, Invalid versions count 0CreateConn rx 4, successful 0, failed 0DeleteConn rx 2, successful 2, failed 0ModifyConn rx 4, successful 4, failed 0DeleteConn tx 0, successful 0, failed 0NotifyRequest rx 0, successful 4, failed 0AuditConnection rx 0, successful 0, failed 0AuditEndpoint rx 0, successful 0, failed 0RestartInProgress tx 1, successful 1, failed 0Notify tx 0, successful 0, failed 0ACK tx 8, NACK tx 0ACK rx 0, NACK rx 0IP address based Call Agents statistics:IP address 10.24.167.3, Total msg rx 8, successful 8, failed 0


Summary

MGCP defines an environment for controlling telephony gateways from a centralized call agent.

There are several advantages to using MGCP controlled gateways as voice gateways.

MGCP components include endpoints, gateways, and call agents.

Calls and connections are basic concepts in MGCP.


Summary (Cont.)

MGCP call flow consists of an exchange of messages between the call agent and the gateway.

The mgcp command can be used to configure residential and trunk gateways on a Cisco router.

Several show and debug commands help to verify an MGCP configuration.


Voice Gateway

Voice-Enabled Router

IP Telephony Router with Cisco Unified Communications Manager Express

Cisco Unified Communications Manager

Switch

Router

POTS Phone

IP Phone

Network Cloud

Line: Serial Line: Ethernet

PC

PBX

Cisco Unified Border Element

IP

Icons


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CVOICE 6.0 S03 L02