Hello,

post the sip trace (e.g., ngrep) with such invites.

Cheers,
Daniel


On 7/8/10 12:53 AM, David wrote:
Hey,

I do not do anything IP level forwarding. All my forwarding is done using Kamailio. It looks like what I am doing is called hairpin routing.

Thanks,

David

On 2010-07-07 18:48, Timo Reimann wrote:
Hi,


David wrote:
I have setup two Kamailio servers, my INVITEs will go through server A,
which forwards to server B which forwards it back to server A.

This is intential, the trouble is when the packet comes back through
server B, nothing has changed so TM sees it as a retransmission.

The difference between the first time through and the second time is the
port 5061 instead of 5060.
If you forward the INVITE from B to A SIP-wise (e.g., by calling
forward()) a new Via header should be added which prevents the spiraled
INVITE message from being considered a retransmission on A.

Do you perform forwarding on a lower level, like IP?


Cheers,

--Timo


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--
Daniel-Constantin Mierla
http://www.asipto.com/


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