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

[Vivek Talwar]

What actually makes A send Re-invite to B before the session is established?
A can send UPDATE in which it can change any of information regarding its contact or IP port for sdp etc. Mostly UPDATE is send after resources are being kept reserved by UAC for qos parameters.



________________________________
From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Ravi Ranjan Sinha
Sent: Wednesday, April 28, 2010 2:28 PM
To: Murali Vuppandla; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Need clarification on Re-Invite ..

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<mailto:ravi-ranjan.sinha.prestataire at sfr.com>

ravi.sinha at aricent.com<mailto:ravi.sinha at aricent.com>
124 Boulevard Verdun - Prologue
92400 Courbevoie
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________________________________
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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