It depends ... RFC 3262 says:

   The UAS MAY send a final response to the initial request before
   having received PRACKs for all unacknowledged reliable provisional
   responses, unless the final response is 2xx and any of the
   unacknowledged reliable provisional responses contained a session
   description.  In that case, it MUST NOT send a final response until
   those provisional responses are acknowledged.

-- 
Gary Cote
www.awardsolutions.com
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