Resubmitted INVITE request for 421 and 420

"Vavilapalli Srikanth-A19563" <[email protected]>
Newsgroups gmane.ietf.sip
Message-ID <[email protected]>
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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