[cisco-voip] call quality issues between gateway and Unity

[Wes Sisk]

Steven,

Thank you for the clarification. Take a look at the Release-note of  
the cited bug in bug toolkit.

There is a different command to use with MGCP:
mgcp playout adaptive 60 40 200

Same underlying behavior, just modified for the call signaling protocol.

/Wes

On Sep 14, 2006, at 8:14 AM, STEVEN CASPER wrote:

It is in the document Playout Delay Enhancements:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/ 
products_feature_guide09186a008008033c.html


in the link on Understanding Jitter that you posted.

http://www.cisco.com/en/US/tech/tk652/tk698/ 
technologies_tech_note09186a00800945df.shtml


Steve

>>> "Wes Sisk" <wsisk at cisco.com> 09/13/06 6:30 PM >>>
Steven,

Where do you get that playout-delay is not supported?

/Wes

STEVEN CASPER wrote:
> Wes,
> I see that Playout-Delay is not supported on MGCP platforms so how
is
> jitter handled in a MGCP/Call Manager enviroment?
>
> Thanks!
> Steve
>
> Steve Casper
> Voice Technologies
> M&T Bank
> (410) 347-6026
>
>>>> "Wes Sisk" <wsisk at cisco.com> 09/11/06 7:00 PM >>>
> Kris,
>
> This sounds very similar to something we fixed long ago.  Take a look

>
> at 'sh voice call' to see if it's jitter:
> http://www.cisco.com/en/US/tech/tk652/tk698/
> technologies_tech_note09186a00800945df.shtml
>
> CSCea35850 - Unity RTP stream has inherent jitter
>
>
> If you are using non-default packetization periods watch out for
> CSCed52913 Unity RTP stream has jitter with G.729 at 30 & 60 ms and

> G711/30ms
>
> /Wes
>
> On Sep 11, 2006, at 5:56 PM, Kris Seraphine wrote:
>
> Hi
>
> I have a customer with a multi site centralized CCM 4.13 cluster.
> The remote sites are getting complaints of poor voice quality from
> customers when being transferred to Unity (which is located in the
> central site) .  The callers cannot understand the greetings and
> describe them as choppy.  There are no problems with external calls

> transferred from the remote sites to IP phones at the central site or

>
> for intersite calls.  It seems to be limited to calls where the RTP

> stream is between a remote voice gateway and Unity.  These calls are

> G.729 so Unity has to transcode the greetings on the fly but if that

> were the problem I'd expect remote users to have the same problem
> when calling into check their messages or leave messages for other
> users.  Also, the Unity server is not very heavily used; it generally

>
> has no more than 9 active calls at the most.
>
> I suspect the gateway might be the problem.  It's a 2851 running
> MGCP.  I guess I'd like to know if anyone agrees or disagrees with
> this assumption.  Also, I've had a lot of problems with MGCP code on

> the ISRs.  Can someone recommend an IOS version that is stable for
> and MGCP gateway and doesn't suffer from DSP firmware issues?
>
> I should mention that Unity is version 4.04 sr1 and the gateway is
> running 12.4(5).
>
> Thanks
>