[SIPForum-discussion] Reject the media stream

[雨 陈]

Hi Mr. VB
   
  I think you are right. Because I had checked a number of call flows and read your comment on this issue again, The F3 200 OK with SDP is not corrected.  The answer SDP should be carried within PRACK. Thank you very much for help me find the Bug!
   
  Furthermore, I want to inquire another problem about SDP exchange:
   
  If the SDP answer reject the media stream and set the “m=” line port value to zero. So the SDP exchange is failure. . 
  I WONDER: In that case, will the session between UA and UB be terminated or just the media negotiation end and the dialog still keep connect?  
   
  Looking forward to your reply !
   
  Happy weekend
   
  Nora
     

      2008/8/24 雨 陈 <chen.yu26 at yahoo.com.cn>
    Hi Vivek,
  What I had mentioned 180/ACK modle is a flow with SDP negociation like this:
 
           User A         User B   
          |                       |              
          |   INVITE F1     |              
          |--------------------> |              
          | 180 [SDP] F2  |   Callee B offer the session discription first           
          |<-------------------- |             
          | 200 [SDP] F3  |   The same SDP Msg from User B .          
          |<-------------------- |              
          | ACK [SDP] F4 |   Caller A answer with his SDP Msg .       
          |--------------------->|              
          |                       | 
          |  RTP Media     |             
          |<======== =>|
  Well, it can be found in the process to create or modify a session. BTW, the User A and User B represent different brand of softswitch. 
   
  Any further dissucion? 
   
  Regards
   
  Nora

Vivek Batra <vivek7683 at gmail.com> 写道：
    
      Hi Nora,
As the possibilities of SDP negotiation stated by you, how can SDP be negotiated between 180 and ACK? Can you please explore??

--Vivek


  On Thu, Aug 21, 2008 at 6:12 AM, 雨 陈 <chen.yu26 at yahoo.com.cn> wrote:
    Hi,
  According to the practical call flow, it seem the offer/answer model of SDP exchange can be found in INVITE/180, INVITE/200, 180/ACK or 200/ACK, even though the 180 response is provisional and sometimes the followed 200 OK send the same SDP Msg to confirm it.
   
  Regards
   
  Nora
  

vijay kant gupta <vijaykant.it2002 at gmail.com> 写道：
    
      See in Offer Answer Model. if u send invite without SDP at that time ACK has to contain SDP for A party.
But if INVITE conatin SDP then 200 ok is Answer for Invite 
ACK is final ACKNOWLEDGE.
  On Wed, Aug 20, 2008 at 3:54 PM, zabi <mohamed.zabiulla at gmail.com> wrote:
              Dear All,
   
      As per my knoweldge, Offer/Answer can occur in INVITE/2XX/ACK.
   
  Given a Sip message containing SDP how do we differentiate whether it is an OFFER/ANSWER??
   
   
  Regards,
  Zabi
   
   








-- 
why run? you'll only die tired!! 
Zabi.


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