"A "session" can contain multiple dialogs. A session is created by a dialog creating request (INVITE/SUBSCRIBE/REFER) and can contain multiple dialogs. For example, an INVITE can fork to multiple UAs. If more than one UAS responds with 1xx/2xx (w/to-tag) multiple dialogs are created. All those dialogs belong to the session. "
I am confused ... A session is is nothing but exchange of media data between participants if I understand 3261 correctly , So an offer/answer exchange is needed to to create such a session , in this example , there will actually be multiple sessions exchanging different kinds of media data (say one audio session and one video session) , so each session is still associated with only one dialog ? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Penfield Sent: Friday, August 11, 2006 5:59 PM To: Benny Prijono; Young Tao Cc: [email protected] Subject: Re: [Sip-implementors] Session, Dialog in RFC > >> Is a session containing serveral dialogs > > No, that's not possible! An INVITE session can only have one > underlying dialog. But, a dialog may have several sessions (for > example, one INVITE session, and multiple event subscription > "sessions"). > "session" is not the correct term here. What you are referring to is a "dialog usage". A "session" can contain multiple dialogs. A session is created by a dialog creating request (INVITE/SUBSCRIBE/REFER) and can contain multiple dialogs. For example, an INVITE can fork to multiple UAs. If more than one UAS responds with 1xx/2xx (w/to-tag) multiple dialogs are created. All those dialogs belong to the session. Most UAs do not support multiple confirmed dialogs that happen when the INVITE reaches multiple UASs and they send a 2xx before the forking proxy can CANCEL them. The UA will typically keep the dialog for the first 2xx it receives, and terminate the dialog for any subsequent 2xx (send ACK, and then BYE). cheers, (-:bob Robert F. Penfield Chief Software Architect Acme Packet, Inc. 71 Third Avenue Burlington, MA 01803 [EMAIL PROTECTED] _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
