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

Fri Oct 10 10:21:53 EDT 2008

>

I just had that exact same problem in 4.1(2), nothing worked or even  
had a noteable impact,
except upgrading to 4.2(3), after having upgraded (last sunday) I  
haven't been unable to replicate the problem.

Check out the patch notes for 4.2(3), there were some changes made to  
sccp packet handling, and a new mode
added for problems with sccp delivery.

>  _____
>
> 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
>
>
>
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> ------------------------------
>
> Message: 2
> Date: Fri, 10 Oct 2008 10:12:19 -0400
> From: "Ryan Ratliff" <rratliff at cisco.com>
> Subject: Re: [cisco-voip] CCM 4.1(3) audio delay !!!
> To: "'Djokic Sinisa'" <sdjokic at mds.rs>,	"'cisco voip'"
> 	<cisco-voip at puck.nether.net>
> Message-ID: <00e801c92ae2$3520fe60$68dd6640 at amer.cisco.com>
> Content-Type: text/plain; charset="us-ascii"
>
> What is the RTT between the gateway and the CCM?  If you are doing H. 
> 323
> slow start then the H.245 negotiation is probably what is slowing  
> you down.
> I'd start by enabling fast-start inbound on the gateway page in  
> CCMAdmin and
> going from there.  The router should try fast-start by default.
>
> If it's not the media negotiation causing this then you need to do  
> some
> digging into debugs at the router and CCM traces.  Compare when CCM  
> sends
> the StartMediaTransmission to the phone versus when the phone starts  
> to send
> audio.   Do the same for when the phone sends the  
> OpenReceiveChannelAck to
> CCM and when it starts to receive audio. A packet capture at the  
> phone will
> help with this.
>
>
> -Ryan
>
>
>
>  _____
>
> 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
>
>
>
>
>
>
>
>
> 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
>
>
>
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