Hi, Refer following latest draft for the SIP message sequences for performing various types of call transfers and conference.
http://www.ietf.org/internet-drafts/draft-ietf-sipping-service-examples-07.t xt Best Regards, Deepak kumar Sr. Software Engineer Global EDge Software Ltd. Bangalore,India +91-9448492335 ----- Original Message ----- From: "Bob Carlson" <[EMAIL PROTECTED]> To: "SIP Implementors" <[EMAIL PROTECTED]> Sent: Friday, November 05, 2004 7:56 AM Subject: [Sip-implementors] Need help on transfer and conference > We are just starting a project that will use SER and I am being forced to > document right now how transfer and conferencing will be handled. I have > spent a lot of time looking for definitive information on the subject with > no luck. Well, maybe too much luck. There seem to be many proposals and > models and so on, but it is not clear to me what is actually being done in > practice. I have downloaded all the RFCs and proposal papers on the > subject. I am still reviewing them, but perhaps the folks on this forum can > help me. > > > > I need to know the SIP message sequences for performing a call transfer and > a blind call transfer and for constructing a conference. I have found > information in proposals, but I need to know what actual, available SIP > phones can do. We have some phones that we will test, but I do not know > what they do when you press their transfer and conference buttons. Pardon > me again for my impatience in asking before I have tried this out. > > > > The Transfer models are straightforward, but conferencing is more > complicated. We must construct a simple conferencing model where the > conferencing is performed by a central server, a SIP IPX. Only conferences > of 3 participants need to be supported. We want it to look exactly like > 3-way calling on your home phone. During a call, put the call on hold with > a conference button, call another phone, hit conference button, the two > calls are joined in a 3-way conference. > > > > The document draft-ietf-sipping-service-examples-07.txt seems to be very > helpful on the subject, but all examples are in the form of 3 or more UAs > and do not address any examples from the point of view of a PBX. I can see > how to extend the examples to a PBX case, except for one aspect. If the > IP-PBX is to perform the action as a proxy, what does the phone send the > IP-PBX to indicate the steps in the process. Put more plainly, what happens > when the user hits the Transfer or Conference button on the phone? What > message is sent to the IP-PBX? > > > > Can anyone tell me where else I should be looking? Is the service examples > draft the best base document to work from? > > > > Thanks in advance, Bob Carlson > > _______________________________________________ > Sip-implementors mailing list > [EMAIL PROTECTED] > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
