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2008 Cisco Systems, Inc. All rights reserved. CVOICE v6.02-1

Configuring Voice Ports

Understanding DialPeers

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Dial Peers and Call Legs

PacketNetwork

Call Leg 1(POTS dial peer)

Call Leg 4(POTS dial peer)

Call Leg 2(VoIP dial peer)

Call Leg 3(VoIP dial peer)

Source Destination

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End-to-End Calls

Source DestinationR1 R2

OriginatingGateway

TerminatingGateway

Call Leg 1(POTS Dial

Peer)

R1 Inbound

Call Leg 4(POTS Dial

Peer)

R2 Outbound

Call Leg 2(Voice Network

Dial Peer)

R2 Outbound

Call Leg 3(Voice Network

Dial Peer)

R2 Inbound

POTS PacketNetwork

POTS

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Types of Dial Peers

A dial peer is an addressable call endpoint.

Dial peers establish logical connections, called call legs, tocomplete an end-to-end call.

Cisco voice-enabled routers support two types

of dial peers: POTS dial peers: Define the characteristics of a traditional

telephony network connection

VoIP dial peers: Define the characteristics of a packet networkconnection

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Dial Peer

VoIP

Telephony

Device

Voice-EnabledRouter

Voice-EnabledRouter

PacketNetwork

POTS

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POTS Dial Peers

Dial Peer 1

Extention 7777

Router 1

Voice Port1/0/0

Configuration for Dial Peer 1 on Router 1:

Router# configure terminalRouter(config)# dial-peer voice 1 potsRouter(config-dialpeer)# destination-pattern 7777Router(config-dialpeer)# port 1/0/0Router(config-Dialpeer)# end

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7/16 2008 Cisco Systems, Inc. All rights reserved. CVOICE v6.02-7

Configuring POTS Dial Peers Practice

R1: 10.1.1.1

R2: 10.1.1.2

IP WAN

PSTN

2222

3111

3112

3113

1/0/0

1/0/0

1/0/1

1/1/01/1/0 2/1/0

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VoIP Dial Peers

IP Cloud

Extension 7777 Extension 8888

R1 R2

L0: 10.18.0.1

R1(config)# dial-peer voice 2 voipR1 (config-dial-peer)# destination pattern 8R1(config-dial-peer)# session target ipv4:10.18.0.1

R2(config)# dial-peer voice 2 potsR2(config-dial-peer)# destination pattern 8R2(config-dial-peer)# forward-digits allR2(config-dial-peer)# port 1/0/0

1/0/0

PBX

Extension 7777 is calling 8888

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Configuring VoIP Dial Peers Practice

PSTN

R1: 10.1.1.1

2222

1/0/0

1/0/1

1/1/0 2/1/0

R2: 10.1.1.2

1/0/0

1/1/0

3112

3111

3113

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Common Destination-Pattern Options

(Optional) Control character indicating that the value is a variable-length dialstring. Using this control character enables the router to wait until all digits are

received before routing the call.

T

Series of digits that specify a pattern for the E.164 or private dialing plantelephone number. Valid entries are the digits 0 through 9, the lettersA through D, and the following special characters:

The asterisk (*) and pound sign (#) that appear on standard touch-tone dialpads.

Comma (,), which inserts a pause between digits.

Period (.), which matches any entered digit (this character is used as awildcard).

Percent sign (%), which indicates that the preceding digit occurred zero ormore times; similar to the wildcard usage.

Plus sign (+), which indicates that the preceding digit occurred one or moretimes.

Circumflex (^), which indicates a match to the beginning of the string.

Dollar sign ($), which matches the null string at the end of the input string.

Backslash symbol (\), which is followed by a single character, and matches

that character. Can be used with a single character with no othersignificance (matching that character).

Question mark (?), which indicates that the preceding digit occurred eitherzero times or one time.

Brackets ([ ]) indicate a range.

Parentheses (( )), which indicate a pattern.

string

(Optional) Character indicating an E.164 standard number.+

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Matching Inbound Dial Peers

Configurable parameters used for matching inbound dialpeers:

incoming called-number: Defines the called number or DNISstring

answer-address: Defines the originating calling number or ANIstring

destination-pattern: Uses the calling number (originating or ANIstring) to match the incoming call leg to an inbound dial peer

Port: Attempts to match the configured dial-peer port to the voiceport that is associated with the incoming call (POTS dial peersonly)

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Default Dial Peer 0

IP Cloud

Extension 7777 Extension 888

10.18.0.1

dial-peer voice 1 potsdestination 7777port 1/0/0

Dial-peer voice 2 voip

destination-pattern 8888session target ipv4:10.18.0.1

1/0/0

Dial Peer 1 Dial Peer 2

dial-peer voice 3 potsdestination 8888port 1/1/0

1/1/0

When extension 7777 calls extension 8888, there is no dial peer on router 2with destination pattern 7777 to match the incoming call leg. Router 2 matchesthe default dial peer 0.

R1 R2

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Matching Outbound Dial Peers

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Summary

Dial peers are used to identify call source and destinationendpoints and to define the characteristics that are applied toeach call leg in the call connection.

A voice call consists of two call legs per voice router.

A dial peer is an addressable call endpoint.

POTS dial peers retain the characteristics of a traditionaltelephony network connection.

Voice-network dial peers are components on an IP network.

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Summary (Cont.)

When a matching inbound dial peer is not found, the routerresorts to the default dial peer.

The destination pattern associates a telephone number with agiven dial peer.

When you are determining how inbound dial peers are matchedon a router, it is important to note whether the inbound call leg ismatched to a POTS or VoIP dial peer.

Outbound dial-peer matching is completed on a digit-by-digitbasis.

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