[SIPForum-discussion] Getting 500 Sip Error

[Raghul Prasanna]

HI Nitin,
 
 The problem could be the UA sending an update before recv 200 OK for the Prack...
 
  I believe the update is trying to mute becoz, the connection info is set 0.0.0.0.....
 
 
The following is somewhat related to your call. So I believe the problem could be to do with the update being sent...
 
 
FROM RFC 3311
 
If the UPDATE is being sent before completion of the initial
         INVITE transaction, and the initial INVITE did not contain an
         offer, the UPDATE can contain an offer if the callee generated
         an offer in a reliable provisional response, and the UAC
         generated an answer in the corresponding PRACK.  Of course, it
         can't send an UPDATE if it has not received answers to any
         other offers it sent in either PRACK or UPDATE, or has not
         generated answers for any other offers it received in an UPDATE
         from the callee.

Thanks,
Raghul

--- On Tue, 11/11/08, nitin kapoor <nitinkapoorr at gmail.com> wrote:

From: nitin kapoor <nitinkapoorr at gmail.com>
Subject: [SIPForum-discussion] Getting 500 Sip Error
To: "discussion" <discussion at sipforum.org>
Date: Tuesday, 11 November, 2008, 9:02 PM

Hello All

There is an issue with one of our customer server Whenever they are
trying to send a call forward through SBC(Nextone) they are getting
Sip Error 500.I have checked and found that is some problem in UAC.
Because according to the traces UAC is sending UPDATE message before
it receives 200 OK for PRACK.. and that's why nextone is sending back
500 Sip Error message to UAC. Its mean UAC is not passing signaling
properly. And as per RFC 3311 its correct.

I have checked that update sdp option is also enable for this customer
in his nextone box.

Can you have a look and share your thoughts on this issue please.
Ethereal traces are attached.

Thanks
Nitin Kapoor
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