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Cisco Dial Peers, Part 1

Nov. 24, 2009
Joe Parlas

Cisco Unified Communication H.323 and SIP gateways will require a dial plan on those gateways to extend calls to endpoints that may be configured. An endpoint may be either an analog or digital voice port that would provide connections to the public switch telephone (PSTN) network or to traditional private branch exchange (PBX) phone switches.

The dial plan configuration uses a construct called "dial peers" and is used on gateways to create, control, or re-direct what is called a call leg. The formal definition of a dial peer is "addressing endpoints" which reside on gateways. The command structure begins in configuration mode on a Cisco Voice Gateway using the following syntax:

Dial-peer voice {tag} {Pots, VOIP}

When using the above statement you must use a numerical tag value that uniquely defines one dial peer from another. The range of the tag values is from 1 to 2147483647. If the endpoint is a phone or fax station, it is not uncommon to use a tag that represents the number dialed to reach that station.

Finally, you need to define the type of endpoint being declared on your first dial-peer statement. Normally the types of dial-peers that one would normally create is POTS and VOIP. The POTS dial-peer type would point to a POTS (Plain Old Telephone System) port that is configured on the gateway itself. A VOIP dial-peer type would point to a Voice Over IP target like another gateway in which a POTS port has been defined.

An example of POTS dial-peer would be on the San Jose Gateway for Phone A would be:

SanJose (Config t) Dial-Peer voice 1 POTS
destination-pattern 4552468
port 1/0/1

Now if you want to setup a call to Raleigh gateway (assuming the ip address is in which you are trying to call a station phone B from Phone A on the San Jose gateway would be:

dial-peer voice 3000 voip
destination-pattern 3006
session target ipv4:

On the next post, dial-peer variables will be addressed.

Author: Joe Parlas

Editor's Note: You can receive official training including experimenting with dial-peer configurations by attending Cisco's CVOICE course.