Cisco 3600 Series Konfigurationshandbuch - Seite 22

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Optimize Dial Peer and Network Interface Configurations

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:

Step

Note

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:

Step

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

VC-34

Voice, Video, and Home Applications Configuration Guide

Command

dial-peer voice number voip

acc-qos [best-effort | controlled-load |

guaranteed-delay]

RSVP reservations are only one-way. If you configure RSVP, the VoIP dial peers on both ends

Command

dial-peer voice number voip

codec [g711alaw | g711ulaw | g729r8]

destination-pattern +14085551234

codec g711alaw

session target ipv4:10.0.0.8

Purpose

Enter the dial-peer configuration mode to

configure a VoIP peer.

Specify the QoS value below which an SNMP

trap will be generated.

Purpose

Enter the dial-peer configuration mode to

configure a VoIP peer.

Specify the desired voice coder rate of speech.