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

[Raj]

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(R)—å › <szj087 at gmail.com> wrote:
>
>> Hi, Vijay
>>
>> Thanks very much for your timely answers.
>>
>> From this specification,  session is a combination of signaling plane
>> and media plane messages and processes that enable two or more
>> participants to communicate. I think session is a larger scope than
>> dialog. In another word, one session can contain more than one dialog.
>> Is what I understand right?
>>
>> Zongjun
>>
>>
>> 2008/4/24, 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
>> >
>> _______________________________________________
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>> This list is for NEW development of the core SIP Protocol
>> Use sip-implementors at cs.columbia.edu for questions on current sip
>> Use sipping at ietf.org for new developments on the application of sip
>>
>
>
>
> --
> BR
> Donald _______________________________________________
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>
> Gaurav Katiyar
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-- 
-Raaz
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