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Optimize Dial Peer and Network Interface Configurations
VC-34
Voice, Video, and Home Applications Configuration Guide
To generate an SNMP trap message if the reserved QoS is less than the configured value for a
selected VoIP peer, use the following commands, beginning in global configuration mode:
Note RSVP reservations are only one-way. If you configure RSVP, the VoIP dial peers on both ends
of the connection must be configured for RSVP.
Configure CODEC and VAD for Dial Peers
Coder-decoder (CODEC) and voice activity detection (VAD) for a dial peer determine how much
bandwidth the voice session uses. CODEC typically is used to transform analog signals into a digital
bit stream and digital signals back into analog signals—in this case, it specifies the voice coder rate
of speech for a dial peer. VAD is used to disable the transmission of silence packets.
Configure CODEC for a VoIP Dial Peer
To specify a voice coder rate for a selected VoIP peer, use the following commands beginning in
global configuration mode:
The default for the codec command is g729r8; normally the default configuration for this command
is the most desirable. If, however, you are operating on a high bandwidth network and voice quality
is of the highest importance, you should configure the codec command for g711alaw or ulaw. Using
this value will result in better voice quality, but it will also require higher bandwidth requirements
for voice.
For example, to specify a CODEC rate of G.711a-law for VoIP dial peer 108, enter the following:
dial-peer voice 108 voip
destination-pattern +14085551234
codec g711alaw
session target ipv4:10.0.0.8
Step Command Purpose
1 dial-peer voice number voip Enter the dial-peer configuration mode to
configure a VoIP peer.
2 acc-qos [best-effort | controlled-load |
guaranteed-delay]
Specify the QoS value below which an SNMP
trap will be generated.
Step Command Purpose
1 dial-peer voice number voip Enter the dial-peer configuration mode to
configure a VoIP peer.
2 codec [g711alaw | g711ulaw | g729r8] Specify the desired voice coder rate of speech.