Re: Resubmitted INVITE request for 421 and 420

Hi,
 
RFC3261 8.1.3.5 is pretty clear:
 
"   In all of the above cases, the request is retried by creating a new
   request with the appropriate modifications.  This new request
   constitutes a new transaction and SHOULD have the same value of the
   Call-ID, To, and From of the previous request, but the CSeq should
   contain a new sequence number that is one higher than the previous."
 
Best regards,
Ben.
 
Ps: Ask questions about the existing protocol at the sip-implementors
list

________________________________

From: [email protected] [mailto:[email protected]] On Behalf Of
Vavilapalli Srikanth-A19563
Sent: donderdag 4 december 2008 10:36
To: [email protected]
Subject: [Sip] Resubmitted INVITE request for 421 and 420


Hi
 
I have a doubt related to resubmitting of the INVITE request for
421/420. Can any one please clarify me?  
 
While re-submitting a INVITE request upon receiving a 421 Extension
Required/420 Bad Extension, Are there any recommendation of using the
same Call-Id/From tag of original INVITE request in the resubmitted
request? If so, is there any reason/use-case for such recommendation?
 
Regards
Srikanth

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