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2008 Cisco Systems, Inc. All rights reserved. CVOICE v6.04-1

Implementing Dial Plans on Voice Gateways

Configuring PathSelection

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Call Routing and Path Selection

Relies on dial peers

Route to

TDM

IP Cisco IOS associates one dial peer to each call leg

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Matching Dial Peers

Cisco Unified CM**

PBX

PSTN

Cisco Unified

CME*/SRST

IP Phone

Analog

Phone

H.323

Gateway

IP

IP

POTSVoIP

VoIPPOTS

POTS POTS

IncomingCall Leg

OutgoingCall Leg

IncomingDial peers

OutgoingDial peers

1

2

3

Gateway

1

2

3

Gateway

withCisco

UnifiedCME*

**Unified CM = Cisco UnifiedCommunications Manager

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Digit-by-Digit Signaling

dial-peer voice 90 potsdestination-pattern 9Tport 0/0/0:23dial-peer voice 90110 potsdestination-pattern 9011Tport 0/0/1:23

User dials90114989123456.

0/0/

0

0/0/1

PSTN

InternationalLong Distance

Carrier

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Destination Pattern Matching

dial-peer voice 1 potsdestination-pattern 555port 0/0/0:23dial-peer voice 2 potsdestination-pattern 555....port 0/0/1:23

User dials 5551234.

0/0/

0

0/0/1

WAN

PSTN

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Inbound dial-peer matching:

Called number (DNIS) with incoming called-number

Calling number (ANI) with answer-address

Calling number (ANI) with destination-pattern

For POTS: voice-port matches with dial-peerport

Still no match: default dial peer 0 is used

Outbound dial-peer matching:

Gateway tries to match called number (DNIS) with destination-pattern

If multiple matches are found, the lowest preference wins.

If equal preferences are found, a random dial peer is chosen.

Matching Inbound and Outbound DialPeers

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7/32 2008 Cisco Systems, Inc. All rights reserved. CVOICE v6.04-7

destination-pattern [+]string[T]

router(config-dial-peer)#

Defines the destination pattern of a dial peer that will be used during

outbound dial-peer matching

incoming called-number [+]string[T]


Specifies the incoming called number that will be used during

inbound dial-peer matching

answer-address [+]string[T]


Specifies the incoming calling number will be used during inbound

dial-peer matching

Call Routing and Path SelectionCommands

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direct-inward-dial


Uses the inbound POTS DNIS to match the outbound dial peer (usuallyrequired for any DID PSTN trunk)

Used to prevent two-stage dialing

Call Routing and Path SelectionCommands (Cont.)

preference [0-9]


Specifies the preference of a dial peer; lower number = higher priority,default=0

no dial-peer outbound status-check pots

router(config)#

Disables status checking of outbound POTS dial peers during call setup;always includes dial peer in call routing, even if POTS status is down;useful for some ISDN links

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Matching Hunt Group Dial Peers

Longest match

Explicit preference

Random selection

Least recent use

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Best Practices

Default POTS dial peer with the direct-inward-dial attribute

Provide Cisco Unified Communications Manager redundancy

PSTN

Cisco Unified CM 110.10.10.2

Cisco Unified CM 210.10.10.3

dial-peer voice 1 potsincoming called-number .direct-inward-dial

dial-peer voice 100 voippreference 1destination-pattern 1...session target ipv4:10.10.10.2

dial-peer voice 101 voippreference 2

destination-pattern 1...session target ipv4:10.10.10.3

Indicates the primaryCisco Unified CM cluster

Indicates the secondaryCisco Unified CM cluster

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Path Selection Strategies

Call routing and path selection to route PSTNcalls over the cheapest possible path

Digit manipulation to support PSTN fallback

Tail-end hop-off (TEHO)

Call routing and path selection to route intersitecalls over WAN links with PSTN fallback

Digit manipulation to route calls over the WANor PSTN

Toll bypass

Call routing and path selection for intersite calls

Digit manipulation to support site-code dialingSite-code dialing

Dial Plan ComponentsPSTN Requirement

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Site-Code Dialing and Toll Bypass

Site codes are assigned to sites.

Users dial + to reach a user in aspecific site.

Site codes should be in a single range, if possible(e.g., 8XX).

The calling number should also include the site code of the callingparty.

This can be done via digit manipulation.

Easy way to solve overlapping numbering plan issues.

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Toll Bypass Example

IP WAN

PSTNPhone2-1

3001Phone2-2

3002

WAN is thepreferred path with

preference 1.

1

dial-peer voice 21 voip

destination-pattern 2...

preference 1

session-target ipv4:192.168.1.1

dial-peer voice 22 pots


prefix 14085552

preference 2

port 0/0/0:23

The PSTN pathis used if theWAN path isnot available.

2San Jose Austin

Phone1-12001

Phone1-22002

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Site-Code Dialing and Toll BypassExample

IP WAN

PSTNPhone1-1

2001Phone1-2

2002Phone2-1

2001Phone2-2

2002

User dials 8012001.

1

San JoseSite Code: 801

AustinSite Code: 802

R3R1

dial-peer voice 801 voipdestination-pattern 801.

session target ipv4:10.10.0.2

10.10.0.2 10.10.0.1

dial-peer voice 802 voipdestination-pattern 802.session target ipv4:10.10.0.1

Phone1-1 rings.Calling number:

8022002

2

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Tail-End Hop-Off

Extends the concept of toll bypass

Uses the WAN for PSTN calls as much as possible

Uses PSTN breakouts closest to the final PSTN destination

Uses PSTN paths as possible backup

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TEHO Scenario

IP WAN

Phone1-12001

Phone1-22002

Phone2-12001

Phone2-22002

San Jose Austin

R1 R3

4085550101

User dials914085550101.

1

Call is routed to SanJose via the WAN.

2

The San JosePSTN phone rings.

4

DID: 408555XXXX DID: 512555XXXX

PSTN

Local San Josegateway is used asthe PSTN breakout.3

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Configuring Site-Code Dialing andToll Bypass

1. Configure voice translation profiles for VoIP intersite routing.

2. Define dial peers for VoIP intersite routing.

3. Configure voice translation rules and profiles for PSTN backuprouting.

4. Define dial peers for PSTN intersite routing.

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IP WAN

PSTNPhone1-1

2001Phone1-2

2002Phone2-1

2001Phone2-2

2002

R1 R3

Users should beable to reach othersites via site codes.

If WAN fails, thePSTN path should

be used.

10.10.0.1 10.10.0.2

San JoseSite code: 801

ext: 2XXX

AustinSite code: 802

ext: 2XXX

Site-Code Dialing and Toll BypassScenario


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IP WAN

PSTNPhone1-1

2001Phone1-2

2002Phone2-1

2001Phone2-2

2002


ext: 2XXX


ext: 2XXX

R1 R3

10.10.0.1 10.10.0.2

voice translation-rule 1

rule 1 /^2/ /8022/


rule 1 /^8022/ /2/

voice translation-profile intersite-out

translate calling 1

voice translation-profile intersite-in

translate called 2


rule 1 /^2/ /8012/


rule 1 /^8012/ /2/

voice translation-profile intersite-out

translate calling 1


translate called 2

Step 1: Configure Voice TranslationRules and Profiles for Intersite Routing


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Step 2: Define Dial Peers for VoIPIntersite Routing

IP WAN

PSTNPhone1-1

2001Phone1-2

2002Phone2-1

2001Phone2-2

2002

10.10.0.1 10.10.0.2



incoming called-number 802


translation-profile incoming intersite-in

translation-profile outgoing intersite-out



incoming called-number 801





ext: 2XXX


ext: 2XXX

R1 R3


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Step 3: Configure Voice Translation Rulesand Profiles for PSTN Intersite Routing

IP WAN

PSTNPhone1-1

2001Phone1-2

2002Phone2-1

2001Phone2-2

2002

R1 R3

10.10.0.1 10.10.0.2


rule 1 /^8012/ /14085552/

voice translation-profile 801PSTN

translate called 3


rule 1 /^8022/ /15125552/


translate called 3


ext: 2XXX


ext: 2XXX


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IP WAN

PSTNPhone1-1

2001Phone1-2

2002Phone2-1

2001Phone2-2

2002

R1 R3

10.10.0.1 10.10.0.2



port 0/0/0:23

preference 1

translation-profile outgoing 801PSTN



port 0/0/0:23

preference 1



ext: 2XXX


ext: 2XXX

Step 4: Define Dial Peers for PSTNIntersite Routing


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Outbound Site-Code Dialing Example

IP WAN

PSTN


rule 1 /^2/ /8022/voice translation-profile intersite-out

translate calling 1





1

2

ANI

DNIS

80220012001

80120018012001OutgoingIncoming

ANI

DNIS

31255520012001

140855520018012001

OutgoingIncoming

408-555-2001 312-555-2001

Site code: 802Site code: 801

1

2R1

10.10.0.1R3

voice translation-rule 3rule 1 /^8012/ /14085552/


translate called 3



preference 1

port 0/0/0:23


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IP WAN

PSTN


rule 1 /^8022/ /2/


translate called 2





ANI

DNIS

80120018012001

20018022001

OutgoingIncoming

10.10.0.1Phone 2-1

2001Phone 2-1

2001

San Jose Austin

R3

Inbound Site-Code Dialing Example

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Configuring TEHO

1. Define the VoIP outbound digit manipulation for TEHO.

2. Define the outbound VoIP dial peer for TEHO.

3. Define the outbound POTS dial peer for TEHO.

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TEHO Scenario

IP WAN

Phone1-12001

Phone1-22002

Phone2-12001

Phone2-22002

San Jose Austin

R1 R3

4085550100

Use the WAN linkfor calls to the SanJose PSTN.

If the WAN fails, usethe Austin PSTN.

192.168.1.1


PSTN

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R3


rule 1 /^2/ /15125552/

voice translation-profile SJC-TEHO-OUT

translate calling 10

Step 1: Define VoIP Outbound DigitManipulation for TEHO

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R3


destination-pattern 91408.......


translation-profile outgoing SJC-TEHO-OUT

Step 2: Define Outbound VoIP TEHODial Peer

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Step 3: Define Outbound POTS TEHODial Peer

R3


destination-pattern 91408.......

prefix 1408

preference 1

port 0/0/0:23

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Summary

The call routing logic on Cisco IOS routers, using the H.323 orSIP protocols, relies on the dial peer construct.

Routers must match the correct inbound and outbound dial peersto successfully complete a call.

Dial peers in a hunt group are selected according to criteria suchas longest match, explicit preference, and random selection.

Best practices include a default POTS dial peer and redundantCisco Unified Communications Manager servers.

When remote sites are involved, different path selectionstrategies are required, including site-code dialing, toll bypass,and TEHO.

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Site-code dialing uses the concept of prefixing a site code in frontof the actual extension and can be combined with toll bypass toroute calls over a WAN link instead of a PSTN connection.

TEHO extends the concept of toll bypass by routing calls over the

WAN to the closest PSTN breakout to avoid costly long distanceand international phone charges.

Site-code configuration requires that each site be assigned aunique site code.

TEHO configuration requires that all calls be routed over the

WAN unless it is down or has been oversubscribed and blockedby CAC.

Summary (Cont.)

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Documents

CVOICE 6.0 S04 L04