Hi,
   
  In the following case how long should the UAC wait for a 487 to be received?
   
  . UAC sends INVITE 
  . UAC receives 180 Ringing
  . Aftering ringing for 45 seconds user hangs up
  . UAC sends CANCEL
   
  Now, a 2543 compliant UAS will not generate a 487. How long should an UAC 
wait in this case before clearing the call reated data?
   
  Thanks
  Andy

                
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