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

Tue May 25 20:16:08 UTC 2010

Murali,

I think in your case Invite retransmission is happening. You can confirm that by checking the logs and comparing the CSEQ of both the INVITE messages and the retransmitted INVITE should not have a TO TAG as the first one. Make sure you have fed in correct signaling IP and PORT for communication; also please make sure the firewall is open for both way communications if there is any. If you are using SBC make sure none of them are in the blacklist.

Hope this will help.

-JP
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From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Abinash Sarangi
Sent: Tuesday, May 25, 2010 7:58 AM
To: rout.shibashankar at gmail.com; ravi.sinha at aricent.com
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Need clarification on Re-Invite ..

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

Sent: Monday, April 26, 2010 12:20 PM
To: discussion at sipforum.org<mailto: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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