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Configuring FXS Interfaces
22 Voice over IP Quick Start Guide
Note The IP addresses shown in this guide are reserved, and are meant only as examples. When
you configure your network, be sure to substitute your own IP addresses.
Now you need to enter only the following commands on the West router from global configuration
mode:
West(config)# dial-peer voice 501 voip
West(config-dial-peer)# dest-pat +1919958....
West(config-dial-peer)# session-target ipv4:192.168.11.3
Cisco IOS software calls the remote network the session target. This command is followed by the
IP address of the remote router. The prefix ipv4 means IP version 4. Alternatively, you can use the
prefix dns followed by the DNS name—for instance:
West(config-dial-peer)# session-target dns:voice.eastrouter.com
These commands are summarized in Figure 17.
Figure 17 West Router Configured for Remote Dial Peers
West
IP cloud
dial-peer voice 501 voip
dest-pat +1919958….
session-target ipv4:192.168.11.3
num-exp 8…. +1919958….
192.168.11.3
East
Source Destination
In general, you have to configure a dial peer on each router for every telephone number (or group of
wild cards) on every other router.
You can make things even easier by configuring number expansion for East router telephone
numbers on the West router:
West(config)# num-exp 8.... +1919958....
919 958-xxxx
Now users can dial a five-digit extension beginning with 8 from a telephone on the West router to
reach a telephone on the East router.
Now the West router is configured to send calls to the East router. Table 6 shows how to configure
the East router to send calls to the West router.
Table 6 East Router Remote Dial Peers with Wild Cards
Remote Location Telephone Number IP Address Dial Peer Tag
West 408 555-xxxx 192.168.19.27 801
10011