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

Fri Oct 10 15:58:38 EDT 2008

Sinisa,

Please make sure that VAD is globally disabled on the CCM. Also, make
sure that your H323 gateways are properly configured:

*         h.323 signaling messages are properly "binded" to the
interface

*         make sure that your routing works fine - all packet are
talking the same path to the CCM

*         make sure that you don't have any major QoS issues. Check a
health of all network devices in the network - CPU, cables, number of
errors on the interfaces. 

*         Ask  Customer do they have any "slowness" in the network

*         make sure that on the H.323 Gw you have voice rtp
send-receive:
http://www.cisco.com/en/US/docs/ios/12_3/vvf_r/vrg_v1_ps1839_TSD_Product
s_Command_Reference_Chapter.html#wp1051361
*         make sure that you are not using default dial peer for the
Voip calls

If you still experience the problem I would recommend upgrading IOS to
12.4.15T in order to gat latest DSP firmware.  Also, you may try to
change signaling protocol from H.323 to MGCP just for the test.
Personally I don't like MGCP but maybe something is going on with CCM on
the H.323 stack.

At the end, I agree with Ryan, you should grab:
*         IP packet capture from wireshark or something
*         Ccm traces SDL and SDI
*         Debug voip ccapi
*         Debug isdn q931
*         H225 and h245 debugs from the gateway

I would recommend opening a TAC case with all those information.

Good Luck
M

Mladen Milanovic

Contact Center Engineer

CCNP, CCVP, CQS- IPTOS, IPTSS 

CTI | Coleman Technologies, Inc.

Cell: 954-547-5692

Fax: 954-838-9017

1550 Sawgrass Corporate Parkway, Suite 360 

Sunrise, FL  33323-2818

Email: mmilanovic at ctiusa.com <mailto:mmilanovic at ctiusa.com> 

MSN:  mladen_milanovic at hotmail.com

URL:   www.ctiusa.com <http://www.ctiusa.com/> 

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 9:57 AM
To: 'Djokic Sinisa'; 'cisco voip'
Subject: Re: [cisco-voip] CCM 4.1(3) audio delay !!!

anybody?.

regards..

Sinisa Djokic 

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

MDS Informaticki inzenjering
Bul. Arsenija Carnojevica 170
11070 Novi Beograd, Serbia
Tel: +381 11 2015 200, 2015 273
Fax: +381 11 3194 954
www.mds.rs
sdjokic at mds.rs

________________________________

From: Djokic Sinisa [mailto:sdjokic at mds.rs] 
Sent: Friday, October 10, 2008 8:12 AM
To: 'cisco voip'
Subject: 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

MDS Informaticki inzenjering
Bul. Arsenija Carnojevica 170
11070 Novi Beograd, Serbia
Tel: +381 11 2015 200, 2015 273
Fax: +381 11 3194 954
www.mds.rs
sdjokic at mds.rs

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20081010/b7f5d3d6/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 3497 bytes
Desc: image001.gif
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20081010/b7f5d3d6/attachment-0002.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 3522 bytes
Desc: image002.gif
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20081010/b7f5d3d6/attachment-0003.gif>