[SIPForum-discussion] Need clarity over Dialog and session in sip.

[Jitendra Bastia]

On Mon, Jun 14, 2010 at 11:06 AM, Santosh Kumar <mail4santoshkb at yahoo.com>wrote:

> Hi all,
>
>   Can anyone kindly clarify what's session and dialog?
>   Did try refering rfc, but that defination was'nt able to digest.
>
>   Have read,
>    session is something to do with media, while dialog is to do with
> signaling.
>
>   Is it true both session and dialog gets established by INVITE and
> terminate with BYE?
>   , in that case what makes unique between each?
>
Jitendra:-yes, session or dialog is created by invite and terminated by BYE.
The uniqueness is that if the first initial invite is for audio then it's a
audio session(same dialog) and if you send re-invite with audio and video
then session is changed(but dialog is same as callid ,from.to tag remains
same in re-invite) so in one dialog u had previously one audio session and
now audio and video session.In precise dialog can have multiple sessions.
Hope this answers your question

>
>  ,Also have read dialog is identified by callid , tag.
>    then how is session is identified?
> Jitendra:-same as above
>  Need your help or links for understanding,
>
>  Thanks
> Santosh
>
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-- 
Thanks & Regards
                           Jitendra
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