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Configuring Voice over IP for Cisco MC3810 Series Concentrators 3

Refer to the “Conﬁguring IP Networks for Real-Time Voice Trafﬁc” section for information

about how to select and conﬁgure the appropriate QoS tools to optimize voice trafﬁc on your

network.

3 Conﬁguring Number Expansion

Use the num-exp command to conﬁgure number expansion if your telephone network is

conﬁgured so that you can reach a destination by dialing only a portion (an extension number) of

the full E.164 telephone number. Refer to the “Conﬁguring Number Expansion” section for

information about number expansion.

4 Conﬁguring Dial Peers

Use the dial-peer voice command to deﬁne dial peers and switch to the dial-peer conﬁguration

mode. Each dial peer deﬁnes the characteristics associated with a call leg. A call leg is a discrete

segment of a call connection that lies between two points in the connection. An end-to-end call

is comprised of four call legs, two from the perspective of the source access server, and two from

the perspective of the destination access server. Dial peers are used to applyattributes to call legs

and to identify call origin and destination. There are two different kinds of dial peers:

(a) POTS—Dial peer describing the characteristics of a traditional telephony network

connection. POTS peers point to a particular voice port on a voice network device. To

minimally conﬁgure a POTS dial peer, you need to conﬁgure the following two

characteristics: associated telephone number and logical interface. Use the

destination-pattern command to associate a telephone number with a POTS peer. Use the

port command to associate a speciﬁc logical interface with a POTS peer. In addition, you

can specify direct inward dialing for a POTS peer by using the direct-inward-dial

command.

(b) VoIP—Dial peer describing the characteristics of a packet network connection; in the case

of Voice over IP, this is an IP network. VoIP peers point to speciﬁc VoIP devices. To

minimally conﬁgure a VoIP peer, you need to conﬁgure the following two characteristics:

associated destination telephone number and a destination IP address. Use the

destination-pattern command to deﬁne the destination telephone number associated with

a VoIP peer. Use the sessiontarget command to specify a destination IP address for a VoIP

peer.

Refer to the “Conﬁguring Dial Peers” section for additional information about conﬁguring dial

peers and dial-peer characteristics.

5 Optimizing Dial Peer and Network Interface Conﬁgurations

You can use VoIP peers to deﬁne characteristics such as IP precedence, CODEC, and VAD. Use

the ip precedence command to deﬁne IP precedence. Use the codec command to conﬁgure

speciﬁc voice coder rates. Use the vad command to disable voice activation detection and the

transmission of silence packets. Refer to the “Optimizing Dial Peer and Network Interface

Conﬁgurations” section for additional information about optimizing dial-peer characteristics.

6 Conﬁguring Voice Ports

You need to conﬁgure your Cisco MC3810 concentrator to support voice ports. In general,

voice-port commands deﬁne the characteristics associated with a particular voice-port signaling

type. Voice ports on the Cisco MC3810 concentrator support three basic voice signaling types:

(a) FXO—Foreign Exchange Ofﬁce interface

(b) FXS—The Foreign Exchange Station interface

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