Re: [Sip] Difference between dialog and session in SIP?
Jonathan Rosenberg <jdrosen@dynamicsoft.com> Thu, 03 April 2003 09:45 UTC
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Date: Thu, 03 Apr 2003 04:41:24 -0500
From: Jonathan Rosenberg <jdrosen@dynamicsoft.com>
Organization: dynamicsoft
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To: Patrick Lam <patrickl@astri.org>
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Subject: Re: [Sip] Difference between dialog and session in SIP?
References: <008a01c2f76c$a8ac0690$2306050a@patrickXP>
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Patrick Lam wrote: > Dear all: > > I am a little confused about the concept of a dialog. What exactly is > the difference between a dialog and a session? A dialog is a sip relationship. A session is a media relationship. > Does dialog mean a "call > has already been setup" in the signaling sense, while a session mean the > "media has already been setup" in the media sense? Thats pretty much right. > > Also, what does "part of a dialog" mean? Are "INVITE", "ACK" and the > responses considered "part of a dialog"? Dialog represents state, which includes sequence numbers, route sets, and URIs. A request sent as part of a dialog means that it includes route headers from the route set of the dialog, and uses the next highest sequence number in the dialog.' > > What does "outside the dialog" mean then? Is a request is outside the > dialog, does it still affect or change anything "inside the dialog" > then? Outside the dialog means that it is not within the context of a dialog. It doesnt use the callid, cseq, or route sets of any existing dialogs, and when such a reuqest is set, it has no impact on the state of an existing dialog. -Jonathan R. -- Jonathan D. Rosenberg, Ph.D. 600 Lanidex Plaza Chief Scientist Parsippany, NJ 07054-2711 dynamicsoft jdrosen@dynamicsoft.com FAX: (973) 952-5050 http://www.jdrosen.net PHONE: (973) 952-5000 http://www.dynamicsoft.com _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use sip-implementors@cs.columbia.edu for questions on current sip Use sipping@ietf.org for new developments on the application of sip
- [Sip] Difference between dialog and session in SI… Patrick Lam
- [Sip] SIP servlet location implementation Shane McCormack
- Re: [Sip] Difference between dialog and session i… Jonathan Rosenberg