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Figure 16
IP Connection Between Routers
408 555-3737
FXS VIC
0/0
192.168.19.27
West
FXS VIC
0/1
408 555-4141
Look at the connection between the West router and the IP network. This connection does not include a voice port or an attached
telephone—it leads from a WAN interface to a remote destination somewhere on the IP network. IP routers can locate IP
addresses on the network, but they cannot locate telephone numbers. To route an outgoing voice call over this connection, the
West router must associate a telephone number in the East office with the IP address of the East router.
Table 5 assigns a dial-peer tag to each telephone number and its associated IP address on the West router. This type of dial peer
is called a remote dial peer or VoIP dial peer. (Remember, the dial-peer tags are arbitrary.) A VoIP dial peer associates a telephone
number with an IP address.
Table 5
West Router Remote Dial Peers
Remote Location
Telephone Number
East
919 555-8282
East
919 555-9595
You can create a VoIP dial peer on the West router for every telephone on the East router, all associated with the same IP address.
But it is much easier to use periods as wildcards, as shown in Table 6.
Table 6
West Router Remote Dial Peers with Wildcards
Remote Location
Telephone Number
East
919 555-xxxx
Construct a table similar to Table 6 for your own routers, assigning your own telephone numbers, IP addresses, and dial-peer
tags.
Note
The IP addresses shown in this guide are meant only as examples. When you configure your network, be sure to use
your own IP addresses.
Enter the following information on the West router to create the dial-peer configuration given in Table 6:
West(config)# dial-peer voice 501 voip
West(config-dial-peer)# destination-pattern 1919555....
West(config-dial-peer)# session target ipv4:192.168.11.3
Cisco IOS software describes the remote network as 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 Domain Name System
(DNS) name, as follows:
West(config-dial-peer)# session target dns:voice.eastrouter.com
Configure a dial peer on each router for each telephone number on every other router connected to it.
FXS VIC
1/0
IP cloud
East
FXS VIC
1/1
Destination Pattern
19195558282
19195559595
Destination Pattern
1919555....
919 555-8282
192.168.11.3
919 555-9595
IP Address
Dial-Peer Tag
192.168.11.3 501
192.168.11.3 502
IP Address
Dial-Peer Tag
192.168.11.3 501
21
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