[Users] How to handle "302 Moved temporarily" with TCP transport and changing port

Klaus Darilion klaus.mailinglists at pernau.at
Wed Jul 12 10:09:00 CEST 2006

For the redirect use the uac_redirect module. It should take care of 
fetching the URI from the Contact: header and use the proper protocol.


Ingmar Kliche wrote:
> Hi all,
> I'm very new to OpenSER and I would like to ask for your advice to find 
> a solution for my problem:
> I have a SIP gateway (A) which uses UDP transport and a SIP endpoint (B) 
> which only supports TCP. I'd like to use OpenSER to convert UDP to TCP. 
> The second issue is that the TCP endpoint (B) will redirect the incoming 
> INVITE to itself to another TCP port using a "302 Moved temporarily" 
> containing a CONTACT header.
> Here is my approach:
> My current understanding is that I would have to add something to the 
> routing block to select the traffic for my TCP endpoint. Then I would 
> have to add route where I would have to handle the TCP forwarding, 
> something like:
> if (uri=~"...") {
> t_relay_to_tcp("<ip>", "5060");
> }
> This looks very straight forward and should solve the UDP to TCP issue 
> as I understand it. Is this approach correct?
> For the second issue I don't have a solution right now. As described 
> above the TCP endpoint (B) will answer something like
> SIP/2.0 302 Moved Temporarily
> FROM: <sip:tel at HOST_A>;tag=1c552078080
> TO: <sip:tel at HOST_B>;tag=7189e7deae
> CALL-ID: 552077216117200615500 at HOST_A <mailto:552077216117200615500 at HOST_A>
> VIA: SIP/2.0/TCP HOST_A;branch=z9hG4bKac552089789;alias
> SERVER: RTCC/2.0.6011.0
> <sip:tel at HOST_B:1223;transport=tcp;maddr=HOST_B;x-mss-call-id=552077216117200615500%40HOST_B> 
> I want OpenSER now to send out another INVITE via TCP to HOST_B Port 
> 1223 (but the port changes for each call). In principle I would need a 
> possiblity to extract the host and the port out of the CONTACT header of 
> the message to send another t_relay_to_tcp("<host>", "<port>"). But how 
> to do that?
> Or is there another possibility to tell OpenSER to take the target info 
> out of the CONTACT header?
> Thanks in advance!
> Ingmar
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