Cisco Systems CISCO1751 Checking Dial Peer Configuration, Calling Between Routers, IP Address

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.

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

408 555-3737

				919 555-8282
	FXS VIC		FXS VIC
	0/0
		1/0
192.168.19.27	West	IP cloud	East	192.168.11.3
	FXS VIC		FXS VIC	919 555-9595
408 555-4141	0/1	1/1
				22335

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.

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

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 10.

Cisco 1751 Voice-over-IP Quick Start Guide

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