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Cisco 1751 Voice-over-IP Quick Start Guide

78-11259-04

Configuring Voice-over-IP

Checking Dial Peer Configuration

If you configured POTS dial peers on your router by following these examples, you can place calls

between telephones connected to the same router. You can also use the show dial-peer voice command

to verify that the data you configured is correct.

Note If the voice port is offline, use the interface configuration no shutdown command to enable it.

Note Although placing calls directly between ports on the same router helps to verify your configuration, it is

not recommended for general telecommunications use.

Calling Between Routers

To enable the West and East offices to send voice traffic to each other over the same IP network they use

for data traffic, use a WIC on each router to provide a connection to the IP network, as shown in

Figure 15.

Figure 15 IP Connection Between Routers

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 know how to locate IP addresses on the network, but they do not know how

to locate telephone numbers. To route an outgoing voice call over this connection, the West router has to

associate a telephone number in the East office with the IP address of the East router.

Table 9 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.) The term VoIP means that the dial peer associates a telephone number with an IP address.

408 555-3737

408 555-4141

FXS VIC

0/0

FXS VIC

0/1

West

919 555-8282

919 555-9595

FXS VIC

1/0

FXS VIC

1/1

East

22335

192.168.11.3

192.168.19.27

IP cloud

Table 9 West Router Remote Dial Peers

Remote Location Telephone Number Destination Pattern IP Address Dial-Peer Tag

East 919 555-8282 19195558282 192.168.11.3 501

East 919 555-9595 19195559595 192.168.11.3 502

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 33 34

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Cisco 1751 Guide d'installation Page 19

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