[SIPForum-discussion] Need clarification on Re-Invite ..

Tue May 25 15:53:40 UTC 2010

I agree to your point..Here is what I thinkBefore session is established :You can use UPDATE to change SDP . If Re-INVITE is sent with a different CSeq it would be considered another transaction before the previous transaction is successfully completed  which will leave the state machines[uac and uas] in an error - like condition. A TU  might sense it as a re-transmitted INVITE as well.
UPDATE can be sent by a UA within a dialog  (early or confirmed) to update session parameters without impacting the dialog state itself.
After the session is established :re-INVITE to change media stream or SDP or any other param or refresher .
What will be the impact at TU level if UPDATE is used after established session ?

Thanks & Regards 

-Abinash 

Date: Tue, 25 May 2010 20:38:26 +0530
Subject: Re: [SIPForum-discussion] Need clarification on Re-Invite ..
From: rout.shibashankar at gmail.com
To: s_abinash at hotmail.com
CC: ravi.sinha at aricent.com; discussion at sipforum.org

No Ravi. The word used by you for re-Invite is wrong. You mentioned "Re-INVITE before an established session is considered as INVITE 
retransmission".On this stage you can not call it as Re-invite. Its just  a re-transmission of original request (INVITE) as per as TIMER.
Again you mentioned "UPDATE can be optionally used for session refreshing . No hard rule of 
using UPDATE and re-INVITE interchangeably after the established session". Ravi,  this is implementation specific. UAC can use INVITE or UPDATE request for  session refreshment.

Hope you got the answer.
Best Regards,S  S Rout

On Tue, May 25, 2010 at 8:27 PM, Abinash Sarangi <s_abinash at hotmail.com> wrote:

Re-INVITE before an established session is considered as INVITE retransmission So SIP extensions came up with the idea of having another method called UPDATE which can be used before successful establishment either to change the SDP or change any params as such.
Through re-INVITE after successful session, we can do SDP change or session refresh etc etc.UPDATE can be optionally used for session refreshing . No hard rule of using UPDATE and re-INVITE interchangeably after the established session

Thanks & Regards 

-Abinash 

Date: Mon, 24 May 2010 23:28:22 +0530
From: rout.shibashankar at gmail.com
To: ravi.sinha at aricent.com

CC: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Need clarification on Re-Invite ..

No 
Ravi,

Its 
not like that. UPDATE can also be used after session establishment.   
After Session establishment UAC uses UPDATE as Session Refresher.

Best
 Regards,
S S 
Rout

On Wed, Apr 28, 2010 at 2:28 PM, Ravi Ranjan Sinha <ravi.sinha at aricent.com> wrote:

Difference between Update & Re-INVITE:

Update could be used before the session is established (before final response & ACK), while Re-INVIE can be used only after session is established.

Regards,

Ravi SINHA

Société Aricent - Prestataire du Groupe SFR

DGRE / Direction Intégration Validation et Bout-en-Bout/CoreMobile

T : 01 71 08 05 50

ravi-ranjan.sinha.prestataire at sfr.com

ravi.sinha at aricent.com

124 Boulevard Verdun - Prologue

92400 Courbevoie

www.sfr.fr 

From: discussion-bounces at sipforum.org [discussion-bounces at sipforum.org] On Behalf Of Murali Vuppandla [mvuppand at cisco.com]

Sent: Monday, April 26, 2010 12:20 PM

To: discussion at sipforum.org

Subject: [SIPForum-discussion] Need clarification on Re-Invite ..

There are two SIP  subscribers A and B configured with G729 codec.

A calls B. B is ringing. Now, I want to simulate a scenario wherein  A sends Re-Invite to B and B responds accordingly. What actually makes A send Re-invite to B before the
 session is established(do we need any extra configurations to simulate this scenario). Any real time scenarios in this regard is much helpful.

And what’s the exact difference between UPDATE and RE-INVITE. I had read somewhere UPDATE is sent before the session is established whereas Re-Invite is sent after the session
 is established. 

Please clarify me on this.

Regards,

Murali.

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