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Cisco 1751 Voice-over-IP Quick Start Guide

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Configuring Voice-over-IP

Enter the following information on the East router to create the dial-peer configuration given in Table 11:

East(config)# num-exp 5.... 1408555....

East(config)# dial-peer voice 801 voip

East(config-dial-peer)# destination-pattern 1408555....

East(config-dial-peer)# session target ipv4:192.168.19.27

These commands are summarized in Figure 17.

Figure 17 East Router Conﬁgured for Remote Dial Peers

Other Routers on the Network

If the path between endpoints of a voice call travels through intermediate routers, configure those routers

for VoIP traffic, as described in the section “Configuring FXS Interfaces” earlier in this guide.

You need to configure POTS or VoIP dial peers on an intermediate router only if that router also has voice

devices attached to it.

Checking FXS Configuration

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

that router to telephones on the remote routers (using just the extension if you configured number

expansion). If you have trouble placing calls, ping the remote router to make sure you have IP

connectivity, or use the show dial-peer voice command to verify that the data you configured is correct.

Note Refer to the section “Tuning Parameters for Real-Time Voice Traffic” if you need to improve the quality

of voice connections.

Configuring FXO Interfaces

FXO interfaces provide a gateway from the VoIP network to the analog PSTN or to a PBX that does not

support E&M signaling so that users can reach telephones and fax machines outside the VoIP network.

Figure 18 shows a typical FXO gateway attached to the West router.

Table 11 East Router Remote Dial Peers with Wildcards

Remote Location Telephone Number IP Address Dial-Peer Tag

West 408 555-xxxx 192.168.19.27 801

408 555-xxxx

EastWest

22639

192.168.19.27

Destination Source

dial-peer voice 801 voip

destination-pattern 1408555….

session target ipv4:192.168.19.27

num-exp 5.... 1408555....

IP cloud

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Cisco 1751 Guide d'installation Page 21