Cisco AS5350XM

Configuring Voice over IP
VoIP Basics
4
Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide
Dial Peers
Each kind of call leg into or out of a gateway—inbound POTS, outbound VoIP, inbound VoIP, and
outbound POTS—must have assigned to it a set of allowable call scenarios, called dial peers.
• POTS dial peers associate gateway ports with destination endpoints. You need a POTS dial peer for
every port-to-endpoint association.
• VoIP dial peers associate destination phone numbers with IP addresses or other means to send
packets to that destination. You need a VoIP dial peer for every set of destination endpoints.
A dial peer is, essentially, a single static route within a routing table. A collection of dial peers
constitutes a dial plan.
Syntax
A POTS dial peer has the following syntax:
dial-peer voice tag pots
destination-pattern number
port port#
other configurable options
where tag is a numeric value of local significance only, number is the full E.164 phone number of the
associated endpoint, and port# is the voice port in the gateway through which the call is transmitted once
a destination pattern is matched.
A VoIP dial peer has the following syntax:
dial-peer voip tag voip
destination-pattern number
session target data address
other configurable options
where tag is a numeric value of local significance only, number is the full E.164 phone number of the
associated endpoint, and data address is the address to which the gateway sends a call whose destination
pattern matches the one in the peer.
Table 14 VoIP Call Flow, Destination Gateway View
Event Leg Type
Gateway receives dialed digits. Inbound VoIP
Gateway does the following:
• Processes information (maps dialed digits, according to information stored
in dial-peer configuration tables, to a destination device).
• Gateway participates in H.323 session across network.
• Processes voice signals and sends packets over network. As appropriate,
sends call-progress and other in-band signals.
• Ends session.
Outbound POTS
plus inbound VoIP