[SIPForum-discussion] [Sip] What's the difference between session and dialog in SIP?

[Shah Newaz]

hi can u help to develop the SIp client software using Visual C#.
 
 
thank u
 
 


Date: Fri, 25 Apr 2008 20:45:48 +0530From: rajasekhar.l at gmail.comTo: gaurav_katiyar at yahoo.comCC: discussion at sipforum.org; szj087 at gmail.com; sip at ietf.org; vkg at alcatel-lucent.com; bmwg at ietf.orgSubject: Re: [SIPForum-discussion] [Sip] What's the difference between session and dialog in SIP?Do u mean, Dialog is at signaling level, session is at media transport level.
On Fri, Apr 25, 2008 at 5:44 PM, gaurav katiyar <gaurav_katiyar at yahoo.com> wrote:

Sip "Session Initiation Protocol". It talks about media session, i mean how to initiate, modify and terminate a session and Dialog provides a sort of context (like caller, callee, location, routing etc.) to modify this session. So dialog is more related to route the sip message to right node and body (SDP) handles media session if present. Dialogs may have media sessions Or may not. 
 
Take an example of B2BUA. It is a type of statefull proxy having two dialog and one media session if doing media routing. 

Donald Lee <baolovebao at gmail.com> wrote:

old good questions in sip, also add another "transaction".

On Fri, Apr 25, 2008 at 8:18 AM, å­™å®—å › <szj087 at gmail.com> wrote:

Hi, VijayThanks very much for your timely answers.From this specification,  session is a combination of signaling planeand media plane messages and processes that enable two or moreparticipants to communicate. I think session is a larger scope thandialog. In another word, one session can contain more than one dialog.Is what I understand right?Zongjun2008/4/24, Vijay K. Gurbani <vkg at alcatel-lucent.com>:



> There is some work progressing in the BMWG WG to create performance>  metrics around SIP.  One of the first tasks in such an endeavor>  is to define the notion of dialogs and sessions.  Please see>  Section 3.1.1 of> https://svn.resiprocate.org/rep/ietf-drafts/gurbani/bmwg-sip-bench-term/draft-ietf-bmwg-sip-term-00.txt>  of the above draft for some insight.>


>  Ëï×Ú¾ý wrote:>> > Hi, Lincoln> >> > thanks for your instructions.> >> > I know that dialog can exist without session since SUBSCRIBE/REFER can> > create dialog and without any media between communication peers.> >> > What I want to know is the relationship of dialog and session when> > they both exist in one communication activity. Take a example, when> > there are 2 person participating talks with voice, we say there is a> > dialog and a session.> >> > But when one caller invites another callee and gets five 200 final> > responses from 5 UA every of which has its own session description. We> > can say that there are 5 dialogs between caller and the other 5> > callees, right? And then what is the exact number of session in this> > scenario? One session or five session? That is what I want to know.> >> > Dialog is determined by dialogID (call-id, from/to tag) and session id> > is determined by session id given in the SDP message.  My answer is> > there are 5 dialog and one session now, right?> >>>  - vijay>  -->  Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent>  2701 Lucent Lane, Rm. 9F-546, Lisle, Illinois 60532 (USA)>  Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}>  WWW:   http://www.alcatel-lucent.com/bell-labs>_______________________________________________Sip mailing list  https://www.ietf.org/mailman/listinfo/sipThis list is for NEW development of the core SIP ProtocolUse sip-implementors at cs.columbia.edu for questions on current sipUse sipping at ietf.org for new developments on the application of sip-- BRDonald _______________________________________________ 
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Gaurav Katiyar
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