Hi,
    Can CRBT works without using Reliable Provisional Response ?


A   ================   INVITE (with SDP offer)  ========================>  B    
 

A  <===============   180 ringing (with SDP answer ) ====================   B  
----------------------> It is not a RPR
 
                                         CRBT  Played

A  <===============     200 OK for INVITE  ( new SDP offer) ===============    B

A  =================   ACK    (new SDP answer)   =======================>   B


Whether the above diagram is a correct call flow for CRBT without using 
Reliable Provisional response?

Regards

Sourav Dhar Chaudhuri
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