El Jueves, 21 de Enero de 2010, Couret Tabt escribió: > > Also, an UPDATE is inmediately replied by the SIP core of the remote > > endpoint. > > Does 'immediate' (above) means 'befor the session is established'?
"Inmediate" means that the remote user (not the SIP UA but the user) will not be asked by his phone to accept or reject the UPDATE. Please, recheck the example I gave about adding video session to an existing audio session. > > In the other hand, re-INVITE could require, in some cases, authorization > > of the user (human user). > > May this be done, as same, by an UPDATE , too? Not AFAIK. > > For example, alice is in an audio call with bob, and > > after some minutes of conversation bob decides to add video to the > > session. This is acomplished by sending a re-INVITE with audio&video SDP. > > Alice's phone receives such re-INVITE and ask the human user to accept or > > reject the video session. > > I understood as follows: > > *A reINVITE MUST NOT be used until completion of the SESSION (NOT dialog). > (For example, the session means a sequence from an INVITE to an ACK.) > > *An UPDATE MAY be used before completion of the SESSION. Yes. This can be used to change the SDP before establishing the dialog. > * Both of them(a reINVITE and UPDATE) MUST NOT be used until completion > of dialog(that means an offer/answer exchange). No, UPDATE can be sent before that as explained above. > *An UPDATE MUST NOT be used before an initial INVITE ( that start a > session). Of course, UPDATE is an in-dialog request. > I think the important point is the following: > "The SESSION and DIALOG are different." They are not the same. -- Iñaki Baz Castillo <[email protected]> _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
