[SIPForum-discussion] proper time to establish stream

[雨 陈]

Hi,
   
  There is another question: What is the real time that the media stream begin to set up?
   
  I think in the two common offer/answer models: INVITE/200 and 200/ACK, they can set up the stream after the SDP answer with 200 and ACK respectively, But what is the matter in the reliable response ? I mean the model INVITE/ 180(183). 
   
  My 2 cents is even though the 180(183) with SDP answer was accepted by the offer entity , the media stream CAN NOT STRAT until the 200 OK for INVITE is received. Because during the early-dialog, the caller may send a CANCEL to break down the call. 
   
  Please correct me if I am wrong. Thanks in advance!
   
  Regards
   
  Nora :)
     
   


       
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