Comments inline: > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Murali > Medikonda > Sent: Wednesday, May 22, 2002 12:01 PM > To: [EMAIL PROTECTED] > Cc: Don McKinney > Subject: [Sip-implementors] OFFER/ANSWER after Hold > > > All, > > consider the following scenario: > > Client A and Client B are in a stable call (SDP is offered in the > INVITE and > is > ANSWERed in the 200OK) > > > Client A holds Client B by sending a re-INVITE (IP address set to > 0.0.0.0) > (I realize this method of holding a session > is no longer recommended) > > Now, when Client A reverts back to B, what should client B's > behaviour be when > > (a) Client A sends a re-INVITE with SDP - offer SDP (new or same as > earlier) and expect an > answer in the 200OK) >
If A offers the same SDP, B will answer with the very same SDP. If some of the existing session characteristics have been modified and/or new media has been added, B will respond accordingly. If new media is to be added, it has to be added to the already negotiated SDP, though. > (b) Client A sends an re-INVITE - with NO SDP - i.e wait for the > offer in 200OK and send an > answer in the ACK. > See the post to the previous question on the list. The UAS would respond with Global Error (6xx). Regards, --victor Victor Paulsamy E-mail: [EMAIL PROTECTED] Senior Software Engineer Phone : 650.930.1339 (Direct) Zapex Technologies, Inc. Phone : 650.930.1300 (Main) Mountain View, CA 94043 Fax : 650.930.1399 > I realize, in general, this is how OFFER/ANSWER model works!! Not > counting the Outstanding > Offers case, are there any restrictions or limitations to this model. > > Specifically, can I do either (a) or (b), when applied to situation > described above viz., when a > session is held and is being retrieved. > > Appreciate your commments > > Murali > > > _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
