[cisco-voip] Crosstalk?

[Chris Ward (chrward)]

Hi Jason,

Are all parties able to hear each other? If this is the case, then there
would have to be some type of conference bridge being invoked which TAC
could find in the traces (barring any DSP malfunction as previously
mentioned). 

We have also seen issues with phones getting into a state where it
actually sends two RTP streams (one from the current call and one left
over from a previous call) which can result in a "cross-talk" type
symptom. The main thing to look for in this scenario is that all parties
would not have two-way audio with one another. Two of the parties would
have two-way audio but the third may only be able to be heard and may
not receive audio from the other two. So please check with the users to
see how audio was heard and perceived.

If it's the second issue, then we would need to find the device that is
accepting audio from the secondary source. Our phones have protections
to only accept audio from the other device it was setup to talk to so it
is unlikely a phone is receiving the secondary stream. But I would start
with the above problem description checks and see what is occurring.
Troubleshooting can start from there.

-Chris


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Matthew Saskin
Sent: Friday, May 29, 2009 12:20 AM
To: Jason Aarons (US); cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CrossTalk?

There have been DSP defects in the past that result in this.  Any
transcoding happening in the path?

-matt


On 5/28/09, Jason Aarons (US) <jason.aarons at us.didata.com> wrote:
> The customer has a Verizon Business SIP Trunk, calls from Telco come
> into SIP CUBE 3845 running 12.4(24)T and then SIP-SIP to CallManager
> 7.0(2) to UCCX 7.0(1)SR1 where Cisco Agent Desktop to 7942
> (G711)(SCCP42.8-4-3S).
>
> What our UCCX 7.0(1) Agents complaining of is what we called CrossTalk
> (bleedover) in the old analog days....given this is all IP I don't see
> how we can have any cross talk. That maybe Verizon at backend switch
is
> experiencing cross talk?
>
> Note From Supervisor;
> I was logged into UCCX Agent Desktop as Ready and received a call and
> started helping the customer, about 2 minutes later, both myself and
the
> customer whom called me in the queue heard our hold music in the
> background, then they heard a co-worker Jon answering a call, "Thanks
> for call Express Parts Look Up, how can I help you?"
>
>
>
>
>
>
>
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