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

[Kris Seraphine]

Thanks for the quick response.

That does sound like my problem although the solutions don't apply to me.

I haven't been able to catch an active call that has these symptoms but I
took a look at the last 100 calls via the show call hist voice command and
the values don't look to me to show much jitter.

There were no lost packets
Only a few calls had 2 or 3 late packets; one call had 7 late packets.
Only a few calls had non-zero values for the GapFilledWith... lines.

I might be interpreting the output wrong though.



On 9/11/06, Wes Sisk <wsisk at cisco.com> wrote:
>
> 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
>
> --
> kris seraphine
> _______________________________________________
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> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>


-- 
kris seraphine
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