[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.
regards
klaus
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
> CSEQ: 1 INVITE
> CALL-ID: 552077216117200615500 at HOST_A <mailto:552077216117200615500 at HOST_A>
> MAX-FORWARDS: 70
> VIA: SIP/2.0/TCP HOST_A;branch=z9hG4bKac552089789;alias
> CONTENT-LENGTH: 0
> SERVER: RTCC/2.0.6011.0
> CONTACT:
> <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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>
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