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Thread: discussion Digest, Vol 18, Issue 32
discussion Digest, Vol 18, Issue 32
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 2007-01-28 11:00:02 
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Today's Topics:

   1. Difference between a session and a dialog in	SIP
      (anuj  srivastava)
   2. Re: Difference between a session and a dialog	in SIP
      (resalath ahamed)
   3. Re: Difference between a session and a	dialog	in SIP
(???)
   4. Re: Difference between a session and a dialog	in SIP
(Kai Zhang)


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----------

Message: 1
Date: 27 Jan 2007 18:07:18 -0000
From: "anuj  srivastava" <anuj18shrediffmail.com>
Subject: [SIPForum-discussion] Difference between a session
and a
	dialog in	SIP
To: <discussionsipforum.org>
Message-ID: <20070127180718.27051.qmailwebmail32.rediffmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hello,Is there a difference between a "session"
and a "dialog" in SIP? If we have multiple calls
in a session, would all of them have different dialog
identifiers?thanksanuj
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Message: 2
Date: Sat, 27 Jan 2007 15:48:03 -0600
From: "resalath ahamed" <resalath.ahamedgmail.com>
Subject: Re: [SIPForum-discussion] Difference between a
session and a
	dialog	in SIP
To: "anuj srivastava" <anuj18shrediffmail.com>
Cc: discussionsipforum.org
Message-ID:
	<3ec935670701271348m7a6ca3f2r47f6165474538e81mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

As i know it a session is term used for voice tx. and a
dialog is identified
by the call parameters i.e. callid, from tag, to tag.

Please reply if this is incorrect.

On 27 Jan 2007 18:07:18 -0000, anuj srivastava
<anuj18shrediffmail.com>
wrote:
>
> Hello,
> Is there a difference between a "session" and
a "dialog" in SIP? If we
> have multiple calls in a session, would all of them
have different dialog
> identifiers?
>
> thanks
> anuj
>
>
> <http://adwork
s.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/sig
nature-home.htm/1507191490Middle5?PARTNER=3>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please
visit
> http:
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> Post to the list at discussionsipforum.org
>
>
>
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Message: 3
Date: Sun, 28 Jan 2007 17:09:26  +0900 (KST)
From: ??? <jasonpolypix.com>
Subject: Re: [SIPForum-discussion] Difference between a
session and a
	dialog	in SIP
To: resalath.ahamedgmail.com
Cc: discussionsipforum.org
Message-ID: <0.91381300_1169971766bora.net>
Content-Type: text/plain; charset="us-ascii"

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Message: 4
Date: Sun, 28 Jan 2007 13:51:29 +0200
From: "Kai Zhang" <braveheart.kaigmail.com>
Subject: Re: [SIPForum-discussion] Difference between a
session and a
	dialog	in SIP
To: "anuj srivastava" <anuj18shrediffmail.com>
Cc: discussionsipforum.org
Message-ID:
	<7e2afbdc0701280351l6c2ded9dkc9e015b9c7adb237mail.gmail.com>
Content-Type: text/plain; charset="gb2312"

Hi
    My summary following:
     A *dialog* represents a peer-to-peer SIP relationship
between two user
agents that persists for some time, as a call-leg.It is
identified at each
UA with a *dialog* ID, which consists of a Call-ID, From tag
and To tag. We
can call a *dialog* is established when three values are
all
generated.????????????????????3G????|
NGN???? | IP???? |???????? | ???????? | ???????????? | 
???????? |2XX.u:y#T

     A *sip transaction* consists of a single request and
any responses to
that request, which includes zero or more provisional
responses and one or
more final responses.The branch parameter value in the VIA
header is used to
identify the transaction created by that request.

     Session: In the SDP specification, a multimedia
*session* is a set of
multimedia senders and receivers and the data streams
flowing from senders
to receivers.  A sessionis defined by the SDP user name,
*session* id,
network type, address type, and address elements in the
origin field.
6c!J0beY
A *session* can have multiple RTP sessions corresponding to
the UDP ports
define in the m= line of the SDP.%nN
q7L%5D*G
m2K

Summay:/ZcT8b_(Df_(R
1.Dialog and tranaction are the cocepts in the signalling
part; But the *
session* is the concept in the media transport part. SIP
uses the SDP to
notify the transport protocol(RTP) to create, add, remove
and modify the
sessions.hm6t+D2vwJ
2.Generally, SIP can invite the user to attend an existing
*session*, which
occures in the conference call. In such case, the To tag as
well as the
call-ID which uniquely identifies a particular invitation,
could be
different to those of the existing *dialog*, so a new
*dialog* is needed. `


/Kevin

27 Jan 2007 18:07:18 -0000, anuj srivastava <anuj18shrediffmail.com>:
>
> Hello,
> Is there a difference between a "session" and
a "dialog" in SIP? If we
> have multiple calls in a session, would all of them
have different dialog
> identifiers?
>
> thanks
> anuj
>
>
> <http://adwork
s.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/sig
nature-home.htm/1507191490Middle5?PARTNER=3>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please
visit
> http:
//sipforum.org/mailman/listinfo/discussion
> Post to the list at discussionsipforum.org
>
>
>


-- 
Do what you want, enjoy what you are doing
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End of discussion Digest, Vol 18, Issue 32
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