Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
POTS dial peer associate a telephone number with a particular voice port so that incoming calls for that
telephone number can be received and outgoing calls can be placed. VoIP dial peers point to specific
devices (by associating destination telephone numbers with a specific IP address) so that incoming calls
can be received and outgoing calls can be placed. Both POTS and VoIP dial peers are needed to establish
VoIP connections.
Establishing communication using VoIP is similar to configuring an IP static route; you are establishing
a specific voice connection between two defined endpoints. As shown in Figure 5, for outgoing calls
(from the perspective of the POTS dial peer 1), the POTS dial peer establishes the source (via the
originating telephone number or voice port) of the call. The VoIP dial peer establishes the destination
by associating the destination telephone number with a specific IP address.
Figure 5 Outgoing Calls from the Perspective of POTS Dial Peer 1
To configure call connectivity between the source and the destination as illustrated in Figure 5, enter
the following commands on router 10.1.2.2:
Router(config)# dial-peer voice 1 pots
Router(config-dial-peer)# destination-pattern 14085554000
Router(config-dial-peer)# port 0/0
Router(config)# dial-peer voice 2 voip
Router(config-dial-peer)# destination-pattern 13105551000
Router(config-dial-peer)# session target ipv4:10.1.1.2
Figure 6 shows how to complete the end-to-end call between dial peer 1 and dial peer 4.
Figure 6 Outgoing Calls from the Perspective of POTS Dial Peer 2
17421
[phone]
[phone]
10.1.2.2
Source Destination
10.1.1.2
Voice port
0/0
Voice port
0/0
Router 1 Router 2
VoIP call leg
dial peer 2
POTS call leg
dial peer 1
IP cloud
17422
[phone]
Router 1
Router 2
VoIP call leg
dial peer 3
POTS call leg
dial peer 4
[phone]
10.1.2.2
SourceDestination
10.1.1.2
Voice port
0/0
Voice port
0/0
IP cloud