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

[shiba shankar rout]

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
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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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