[cisco-voip] One way talk path

[Christopher Trown]

On 8/12/2010 1:21 PM, Ed Leatherman wrote:
> Christopher, I would suggest investigating the network between the IP
> Phone and your 2921.. sounds like RTP packets are not getting from the
> Cisco IP Phone network to the 2921. Perhaps routing or an ACL is
> blocking those RTP packets.
> 


     After sniffing traffic to see where frames were going, I figured
out the issue.

     A loopback address was added to the router in question.  The phones
then started sending their traffic to that address.  However, there was
an ACL in the way.

     There was another post about SPANning traffic yesterday that was
quite fortuitous in it's timing.  Made it easy.

     Thanks all.

Chris...

> On Thu, Aug 12, 2010 at 12:18 PM, Christopher Trown <ctrown at uoregon.edu> wrote:
>>
>>
>>     Greetings.  I'll start off by saying that I'm fairly new to CUCM.
>> I come from the Avaya world.  We've set up a test platform, running
>> version 7.1.3.3.  The Gateway is a 2921.  It's talking to our
>> Avaya(5.2.1SP3) system over a QSIG trunk.
>>
>>     I had calls traversing the trunk, sets from both sides could hear
>> each other, CallerID information was sent.  I even managed to get
>> integration with our AVST voicemail system working.  I was quite pleased
>> with that given that we are dealing with three systems from different
>> vendors.
>>
>>     Sometime in the last few days, a one-way talk path appeared.  This
>> only affects calls between the two PBXs.  Sets on the Avaya side cannot
>> hear sets on the Cisco side.  I can hear myself in the earpeice of the
>> Cisco phone.  Cisco sets can hear Avaya sets.  Calls from one Cisco set
>> to another Cisco set work just fine.
>>
>>     I've tried reseting the QSIG trunk from the Cisco and the Avaya
>> end.  I also tried restarting the router that terminates the T1.
>> Nothing has worked.
>>
>>     Any thoughts as to where to look?
>>
>>     Thanks.
>>
>> Chris...
>>



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