[cisco-voip] CCM 4.1(3) audio delay !!!

Fri Oct 10 16:33:05 EDT 2008

Try this command on your gateways if you don't Have it

voice rtp send-recv

To establish a two-way voice path when the Real-Time Transport Protocol (RTP) channel is opened, use the voice rtp send-recv command in global configuration mode. To reset to the default, use the no form of this command.

voice rtp send-recv

no voice rtp send-recv

Syntax Description

This command has no arguments or keywords.

Defaults

The voice path is cut-through in only the backward direction when the RTP channel is opened.

Command Modes

Global configuration

Command History
Release

Modification

12.1(5)T

This command was introduced on the Cisco 2600, Cisco 3600, Cisco 7200, Cisco 7500, Cisco AS5300, Cisco AS5800, and Cisco MC3810.

12.2(2)XA

This command was implemented on the Cisco AS5350 and Cisco AS5400.

12.2(2)XB1

This command was implemented on the Cisco AS5850.

12.2(11)T

This command was integrated into this release.

Usage Guidelines

This command should be enabled only when the voice path must be cut-through (established) in both the backward and forward directions before a Connect message is received from the destination switch. This command affects all VoIP calls when it is enabled.

Examples

The following example enables the voice path to cut-through in both directions when the RTP channel is opened:

voice rtp send-recv

Jorge Rodríguez Aguila
CCNA,CCVP,CRMCS,CIPCES
Senior Voice/Data Network Consultant
Netxar Technologies
jorge.rodriguez at netxar.com
Office 787-765-0058
PCS 787-688-8530
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From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Djokic Sinisa
Sent: Friday, October 10, 2008 2:12 AM
To: 'cisco voip'
Subject: [cisco-voip] CCM 4.1(3) audio delay !!!

hi group..

does anybody has an idea what could be the cause of the following problem..
we have a CCM4.1(3) cluster with 2x 2851 as a h323 gateways..the phones are 7912, 7940, 7960 and 7970..

the problem is as follows..

when external caller makes a call to IP phone inside a CCM cluster the call comes over PSTN and PRI..
the IP phone rings, somebody answers the phone..caller starts to talk immedialtely..for first 2-3 seconds person on the IP phone cannot hear anything, and after that interval everything is fine..no conversation is lost..just for first 2-3 seconds it looks like conversation is delayed but not lost, and afterwards everything is fine..

in opposite direction..

when IP phone makes a call to some external number over the PSTN and PRI..external phone rings..somebody answers.. caller starts to talk immedialtely.. external phone can hear a caller from IP phone side but have lost first 2-3 seconds of conversation..afterwards everything is fine..

ther is no firewall between any of the devices, everything is clear..

any ideas?..

thanx..

regards..

Sinisa Djokic
System Engineer
CCNP,CCDA,CQS-CWLDS,CS-CIPTDS,CS-CIPCCES Cisco Certified

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