[cisco-voip] SIP trunk one way audio

[Bill Riley]

When I change it to MTP required on the sip trunk everything works as
expected. The point is that I shouldn't need to have this configuration. 

 

From: Ryan Ratliff [mailto:rratliff at cisco.com] 
Sent: Friday, November 12, 2010 9:00 AM
To: Bill Riley
Cc: 'Cheng, Karen'; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] SIP trunk one way audio

 

I see lots of discussion around config and call flow but have you actually
done any troubleshooting?  One way audio most of the time comes down to the
simple fact that one party is not receiving RTP from the other.   For these
one-way audio calls you need to determine what IP addresses are involved.
Next verify this in the signaling via the SDPs in the SIP messages.   You
can then use show commands on the router to confirm where it thinks it
should be sending and receiving RTP to/from and if in fact packet counters
are incrementing.

 

If no MTP is being used for the call, try forcing it to use one and see if
that fixes the issue.

If you are using media flow-through (default) does changing it to
flow-around fix the issue? 

 

-Ryan

 

On Nov 12, 2010, at 8:09 AM, Bill Riley wrote:





I shouldn't need an MTP for this connection. All SIP traffic is sourced from
one interface.  I do have SCCP traffic sourced from a different interface
but it is only used for a conference bridge, not MTP.

 

From: Cheng, Karen [mailto:Karen.Cheng at racq.com.au] 
Sent: Thursday, November 11, 2010 9:14 PM
To: 'Bill Riley'
Subject: RE: [cisco-voip] SIP trunk one way audio

 

Not sure if you have checked already but is your SIP trunk using one
interface and your MTP/SCCP interface a different interface?

 

I had one-way audio/no audio problems ages back due to this because our
integrator had configured the SIP trunk to point to int gi0/0's IP and then
configured the SCCP interface to loopback0.

 

Regards

 

Karen Cheng

Voice Network Engineer

 

 

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill Riley
Sent: Friday, 12 November 2010 2:15 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] SIP trunk one way audio

 

I have a new SIP trunk terminating in a 2921 CUBE bundle. When I call in
from the Trunk directly to an IP phone it works correctly. If I call from
the trunk to IP phone and the IP phone transfers the call without waiting
for the remote party to answer I get one way audio. From reading this looks
like and MTP issue but I have an MTP set in the MRGL for the trunk.


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