Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
Outbound Dialing on POTS Dial Peers
When a router receives a voice call, it selects an outbound dial peer by comparing the called number
(the full E.164 telephone number) in the call information with the number configured as the destination
pattern for the POTS dial peer. The router then removes the left-justified numbers corresponding to the
destination pattern that matches the called number. If you have configured a prefix, the prefix is put in
front of the remaining numbers, creating a dial string, which the router then dials. If all numbers in the
destination pattern are removed, the user receives (depending on the attached equipment) a dial tone.
For example, suppose there is a voice call with the E.164 called number of 1(310) 767-2222. If you
configure a destination-pattern of 1310767 and a prefix of 9, the router removes 1310767 from the
E.164 telephone number, leaving the extension number of 2222. It will then prefix 9, to the front of the
remaining numbers, so that the actual numbers dialed are 9, 2222. The comma in this example means
that the router will pause for one second between dialing the 9 and the 2 to allow for a secondary dial
tone.
For additional POTS dial-peer configuration options, refer to the “VoIP Commands” chapter.
Configure VoIP Dial Peers
VoIP dial peers enable outgoing calls to be made from a particular telephony device. To configure a
VoIP dial peer, you need to identify the dial peer (by assigning it a unique tag number), define its
destination telephone number, and define its destination IP address. As with POTS dial peers, under
most circumstances the default values for the remaining dial peer configuration commands are adequate
to establish connections.
To enter the dial peer configuration mode (and select VoIP as the method of voice-related
encapsulation), use the following global configuration command:
Router(config)# dial-peer voice number voip
The number value of the dial-peer voice voip command is a tag that uniquely identifies the dial peer.
To configure the identified VoIP dial peer, use the following dial peer configuration commands
For additional VoIP dial peer configuration options, refer to the “VoIP Commands” chapter. For
examples of how to configure dial peers, refer to the “VoIP Configuration Examples” chapter.
Command Task
Step 1
destination-pattern string Define the destination telephone number associated with this
VoIP dial peer.
Step 2
session target
{ipv4:destination-address |
dns:host-name}
Specify a destination IP address for this dial peer.