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

[Abinash Sarangi]

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

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ravi.sinha at aricent.com
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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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