[SR-Users] Kamailio, spiral with TM

[David]

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
>