Configuring POTS Dial Peers
Before the configuration of Cisco IOS dial peers can begin, you must have a good understanding
of where the edge devices reside, what type of connections need to be made
between these devices, and what telephone numbering scheme is applied to the devices.
Follow these steps to configure POTS dial peers:
Step 1. Configure a POTS dial peer at each router or gateway where edge telephony
devices connect to the network.
Step 2. Use the destination-pattern command in dial-peer configuration mode to
configure the telephone number.
Step 3. Use the port command in dial-peer configuration mode to specify the physical
voice port that the POTS telephone is connected to.
The dial-peer type will be specified as POTS because the edge device is directly connected
to a voice port, and the signaling must be sent from this port to reach the device. Two
basic parameters need to be specified for the device: the telephone number and the voice
port. When a PBX is connecting to the voice port, a range of telephone numbers can be
specified.
Figure 3-26 shows a POTS dial peer. Example 3-9 illustrates proper POTS dial-peer configuration
on the Cisco voice-enabled router shown in Figure 3-26. The dial-peer voice 1
pots command notifies the router that dial peer 1 is a POTS dial peer with a tag of 1. The
tag is a number that is locally significant to the router. Although the tag does not need to
match the phone number specified by the destination-pattern command, many administrators
recommend configuring a tag that does match a dial-peer’s phone number to help
make the configuration more intuitive. The destination-pattern 7777 command notifies
the router that the attached telephony device terminates calls destined for telephone number
7777. The port 1/0/0 command notifies the router that the telephony device is
plugged into module 1, VIC slot 0, and voice port 0.
Figure 3-26 POTS Dial Peer
Example 3-9 Configuration for Dial Peer 1 on Router 1
168 Authorized Self-Study Guide: Cisco Voice over IP (CVOICE)
Router1
Dial Peer 1
Voice Port
1/0/0
Ext. 7777
V
Router1#configure terminal
Router1(config)#dial-peer voice 1 pots
Router1(config-dialpeer)#destination-pattern 7777
Router1(config-dialpeer)#port 1/0/0
Router1(config-dialpeer)#end