On 13 Feb 2006 at 15:36, Pekka Pessi wrote: > Hello, Marcin, > > On 2/13/06, Marcin Michalak <[EMAIL PROTECTED]> wrote: > > I need to implement the following scenario for the project that I'm > > developing. The call is established as follows: > > INVITE > > 183 Session Progress > > PRACK > > 200 OK PRACK > > UPDATE > > 200 OK UPDATE > > 180 RINGING > > 200 OK INVITE > > ACK > > > > Do You think it will be easy to implement this flow in sip-sofia? > > Oh. That is trivial. The tricky part is the SDP handling. > > Do you want to have real precondition negotiation there, like, do you > want to have a=des and a=conf attributes in SDP? And, are you content > with the RFC3312-like call setup where first offer-answer happens in > INVITE-183 and second in UPDATE/200-to-UPDATE, or do you want to have > 3GPP IMS-like three phase call setup with PRACK/200-to-PRACK selecting > only a single speech codec? > > --Pekka Hej, Glad to hear it should be trivial :-) Anyway, I have a=des attributes, but I'm happy as long as they are parsed. The whole negotiation in done by the software which is already written, similar to RFC3312. All I basically need is a SIP stack, which will work without crashing :-) I'll try to implement it then, we'll see how trivial it will be for me... Marcin ---------------------------------------------------------- Marcin Michalak Research Engineer Mobile: +41 79 330 83 51 Telscom AG
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