Hi Everybody,
   
  I would like to know.. why there is no acknowledge for ACK sent by A to B.
   
  How will A know whether B has acknowledged A's ACK.....
   
  A -----Invite-----  B
   
  A------Ringing----B
   
  A-------OK------   B
   
  A-----ACK-------  B
   
  Thanks in Advace,
  Ravichandra

                        
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