Cvoice 6.0 S02 L03

Understanding Dial Peers

Configuring Voice Ports

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—2-1

Dial Peers and Call Legs Source

Destination Packet Network

Call Leg 1 (POTS dial peer)

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Call Leg 2 (VoIP dial peer)

Call Leg 3 (VoIP dial peer)

Call Leg 4 (POTS dial peer)

CVOICE v6.0—2-2

End-to-End Calls Source

R1

R2 Packet Network

POTS Originating Gateway

Destination POTS

Terminating Gateway

Call Leg 1 (POTS Dial Peer)

Call Leg 2 (Voice Network Dial Peer)

Call Leg 3 (Voice Network Dial Peer)

Call Leg 4 (POTS Dial Peer)

R1 Inbound

R2 Outbound

R2 Inbound

R2 Outbound

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—2-3

Types of Dial Peers  A dial peer is an addressable call endpoint.  Dial peers establish logical connections, called call legs, to complete 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 network connection

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—2-4

Dial Peer Voice-Enabled Router Telephony Device POTS Voice-Enabled Router

VoIP

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Packet Network

CVOICE v6.0—2-5

POTS Dial Peers Dial Peer 1

Voice Port 1/0/0

Router 1

Extention 7777 Configuration for Dial Peer 1 on Router 1: Router# configure terminal Router(config)# dial-peer voice 1 pots Router(config-dialpeer)# destination-pattern 7777 Router(config-dialpeer)# port 1/0/0 Router(config-Dialpeer)# end

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CVOICE v6.0—2-6

Configuring POTS Dial Peers Practice

3111 R1: 10.1.1.1

1/0/0

IP WAN

1/0/1 R2: 10.1.1.2

3112

1/0/0 2222

1/1/0

2/1/0

PSTN

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1/1/0 3113

CVOICE v6.0—2-7

VoIP Dial Peers R2(config)# dial-peer voice 2 pots R2(config-dial-peer)# destination pattern 8… R2(config-dial-peer)# forward-digits all R2(config-dial-peer)# port 1/0/0

Extension 7777 is calling 8888 R1

R2 IP Cloud

Extension 7777

1/0/0 L0: 10.18.0.1

PBX

Extension 8888

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

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CVOICE v6.0—2-8

Configuring VoIP Dial Peers Practice

R1: 10.1.1.1

1/0/0

3111

1/0/1

3112

1/1/0

3113

R2: 10.1.1.2

1/0/0 2222

1/1/0

2/1/0

PSTN

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—2-9

Common Destination-Pattern Options +

(Optional) Character indicating an E.164 standard number. Series of digits that specify a pattern for the E.164 or private dialing plan telephone number. Valid entries are the digits 0 through 9, the letters A through D, and the following special characters:  The asterisk (*) and pound sign (#) that appear on standard touch-tone dial pads.  Comma (,), which inserts a pause between digits.

string

T © 2008 Cisco Systems, Inc. All rights reserved.



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



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



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



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 other significance (matching that character).



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



Brackets ([ ]) indicate a range.



Parentheses (( )), which indicate a pattern.

(Optional) Control character indicating that the value is a variable-length dial string. Using this control character enables the router to wait until all digits are received before routing the call. CVOICE v6.0—2-10

Matching Inbound Dial Peers Configurable parameters used for matching inbound dial peers:  incoming called-number: Defines the called number or DNIS string  answer-address: Defines the originating calling number or ANI string  destination-pattern: Uses the calling number (originating or ANI string) to match the incoming call leg to an inbound dial peer  Port: Attempts to match the configured dial-peer port to the voice port that is associated with the incoming call (POTS dial peers only)

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CVOICE v6.0—2-11

Default Dial Peer 0 Dial Peer 2

Dial Peer 1

10.18.0.1 1/0/0

Extension 7777

1/1/0

IP Cloud R1

dial-peer voice 1 pots destination 7777 port 1/0/0

R2

Extension 888

dial-peer voice 3 pots destination 8888 port 1/1/0

Dial-peer voice 2 voip destination-pattern 8888 session target ipv4:10.18.0.1 When extension 7777 calls extension 8888, there is no dial peer on router 2 with destination pattern 7777 to match the incoming call leg. Router 2 matches the default dial peer 0. © 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—2-12

Matching Outbound Dial Peers

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CVOICE v6.0—2-13

Summary  Dial peers are used to identify call source and destination endpoints and to define the characteristics that are applied to each 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 traditional telephony network connection.  Voice-network dial peers are components on an IP network.

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CVOICE v6.0—2-14

Summary (Cont.)  When a matching inbound dial peer is not found, the router resorts to the default dial peer.  The destination pattern associates a telephone number with a given dial peer.  When you are determining how inbound dial peers are matched on a router, it is important to note whether the inbound call leg is matched to a POTS or VoIP dial peer.  Outbound dial-peer matching is completed on a digit-by-digit basis.

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—2-15

© 2008 Cisco Systems, Inc. All rights reserved.

CVOICE v6.0—2-16