HI.. All,
 
In the below scenario Is offer /Answer Still required Even if its
completed in INV & 180 ??.
 
Understanding Early Dialog Establishment is it right way to send PRACK
request & response without SDP. ??
 
 
UAC                                   UAS
 
                 INV(offer)
 ---------------------------------------------->
               180(Answer)
<---------------------------------------------
               PRACK ( SDP/OFFER still required ???)
----------------------------------------------->
               200 OK (SDP/Answer still required ????)
<---------------------------------------------
               200 OK(INV)
<---------------------------------------------
              ACK 
----------------------------------------------->
 
Reagrds
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