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

[seshagiri]

Hi


Session is subset of dialog.

For any call dialog is must but not session.

dialog is created from to,from and callid.

After dialog established ,if the call is successful and  media starts
flowing(RTP) ,then it is said to session established.

For un-successful calls media couldn't established , so there is no session
, but for this also dialog gets created.

For Register request, dialog establishes but there is no media ,so no
session.


Regards
Sesh

On Fri, Jun 18, 2010 at 9:26 PM, Jitendra Bastia
<jitendrabastia at gmail.com>wrote:

>
>
> 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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