Re: getNewClientTransaction - Transaction already exists!

I think that my confusion was due to bad sip message flux examples
(tech-invite).
By RFC3261, the Via branch ID must be unique for each new client
transaction.
So I will have to change the logic in the UA to remove the via's branch ID
each time it sends a request based in a previous SIP message.
Please correct me if I'm wrong.

Miguel Freitas

On 1/18/07, Miguel Freitas <[email protected]> wrote:
>
>
> Hi all.
>
> I'm making the port of the SIP-Communicator UA (old version) for the most
> recent version of JAIN-SIP but I'm facing several problems.
> The one that I'm stuck now occurs when I try to respond with another
> Register request to the 401 Unauthorized response when I try to register the
> UA.
>
> In the UA I have something like this:
>    ClientTransaction retryTran = sipProvider.getNewClientTransaction
> (request);
>
> It worked fine with an older JAIN-SIP.
> But now I see that SipProviderImpl.getNewClientTransaction (Request) has
> been totally re-written and I'm getting the Exception
> javax.sip.TransactionUnavailableException: Transaction already exists!
>
> This is the top Via in the Request that I'm trying to send:
> getTopmostVia() = Via: SIP/2.0/UDP 10.112.64.231:5060
> ;branch=z9hG4bK63e17a0c6cf77b3b953c22feb75e3db5
>
> The branch ID is equal to the branch ID sent in the first Register
> request.
> So I must be getting this exception because the last condition fails on
> the IF clause:
>
> SipProviderImpl.getNewClientTransaction(Request)
> (...)
>         if (sipRequest.getTopmostVia().getBranch() != null &&
>              sipRequest.getTopmostVia().getBranch().startsWith(
> SIPConstants.BRANCH_MAGIC_COOKIE ) &&
>              sipStack.findTransaction((SIPRequest)request, false) != null)
> {
>             throw new TransactionUnavailableException("Transaction already
> exists!");
>         }
> (...)
>
> My question is: do I have to explicity terminate the previous Client
> Transaction? If so, how can I do that?
>
>
> Regards,
> Miguel Freitas
>
> --
> - - - -                                     - - - -
> - Telecommunications Institute   -
> - Instituto de Telecomunicacoes  -
> - Aveiro, Portugal                         -
> - www.it.pt                                    -
> - - - -                                     - - - -

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