Cisco MC3810-APM-FXO= Datasheet download pdf (Page 59)

Configuring Voice Ports

Configuring Digital Voice Ports

VC-93

Cisco IOS Voice, Video, and Fax Configuration Guide

Note Prior to Cisco IOS Release 12.1(5)T, playout delay was configured in voice-port configuration mode.

For Cisco IOS Release 12.1(5)T and later releases, in most cases playout delay should be configured

in dial-peer configuration mode on the VoIP dial peer that is on the receiving end of the voice traffic

that is to be buffered. This dial peer senses network conditions and relays them to the DSPs, which

adjust the jitter buffer as necessary. When multiple applications are configured on the gateway,

playout delay should be configured in dial-peer configuration mode. When there are numerous dial

peers to configure, it might be simpler to configure playout delay on a voice port. If there are

conflicting playout delay configurations on a voice port and also on a dial peer, the dial peer

configuration takes precedence.

To configure the playout delay jitter buffer, use the following commands beginning in dial-peer or

voice-port configuration mode:

Command Purpose

Step 1

Router(config-voiceport)# playout-delay mode {adaptive

| fixed}

Determines the mode in which the jitter buffer will

operate for calls on this voice port.

The keywords are as follows:

• adaptive—Adjusts the jitter buffer size and

amount of playout delay during a call based

on current network conditions.

• fixed—Defines the jitter buffer size as fixed

so that the playout delay does not adjust

during a call. A constant playout delay is

added.

The default is adaptive.

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Cisco MC3810-APM-FXO= Datasheet Page 59