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Local Dial Peers
To route a received voice call to the right destination, the router needs to know which telephone
number belongs to each voice port. For instance, if a call comes in for 408 555-3737, the router needs
to know that this telephone is connected to voice port 2/0/0 (as shown in Figure 12). In other words,
the router needs to know the information in Table 1.
To hold this information, Cisco IOS software uses objects called dial peers. A telephone number, a
voice port, and other call parameters are tied together by associating them all with the same dial peer.
Configuring dial peers is similar to configuring static IP routes—you are telling the router what path
to follow to route the call.
Dial peers are identified by numbers, but to avoid confusing these numbers with telephone numbers,
they are usually referred to as tags. Dial peer tags are integers that can range from 1 to 231 -1
(2147483647), which should be enough for most purposes. Dial peers on the same router must have
unique tags, but you can reuse the tags on other routers.
Table 2 assigns each phone number-voice port pair on the West router a dial peer tag. Within the
allowed range, you can choose any dial peer tag or any system that is convenient or makes sense to
you. This type of dial peer is called a POTS dial peer or a local dial peer. The term “POTS” (plain
old telephone service) means that the dial peer associates a physical voice port with a local telephone
device. (Another type of dial peer is explained in the section “Calling Between Routers.”)
Table 2 West Router Local Dial Peers
Telephone Number Voice Port Dial Peer Tag
408 555-3737 2/0/0 401
408 555-4141 2/0/1 402
You should construct a table similar to Table 2 for your own routers, assigning your own telephone
numbers and dial peer tags.
Note The telephone numbers used in this guide are only examples, and are generally invalid for
public use in the United States. When you configure your network, be sure to substitute your own
telephone numbers.
To configure the router with the information in the table, enter the following commands in global
configuration mode:
West(config)# dial-peer voice 401 pots
West(config-dial-peer)# dest-pat +14085553737
West(config-dial-peer)# port 2/0/0
West(config)# dial-peer voice 402 pots
West(config-dial-peer)# dest-pat +14085554141
West(config-dial-peer)# port 2/0/1
West(config-dial-peer)# exit
West(config)#
These commands are summarized in Figure 13.
Local Dial Peers
Voice over IP Quick Start Guide 17