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Thread: 200/Invite crossing with Cancel
200/Invite crossing with Cancel
user name
 2006-04-04 19:11:51 

  


  

    





Currently in our UAS state machine if we receive a CANCEL
after we have already sent a 200 to an Invite, then we just 200 the Cancel and
continue to wait for the ACK.



 



The exceptional-procedures draft recommends in this case
that we send a 481 response to the Cancel (since we are not processing it).  The
UAC should then ACK our 200 and send a BYE to terminate the session.



 



I was considering change resip to follow the draft, so it
will 481 the cancel instead of 200ing it.  What do you guys think the most
correct thing to do here is?  A 481 may be a little miss-leading, since
the dialog does in-fact exist.  Also a 200 is misleading, since we not
going to cancel the transaction.



 



Scott Godin 



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    200/Invite crossing with Cancel
  


  

     user name

     2006-04-06 20:56:22
  


  

    

  


  

    No, the exceptional-procedures draft isn't right on this one yet.

This is one of the places where 3261 is actually clear:
   Regardless of the method of the original request, as long as the
   CANCEL matched an existing transaction, the UAS answers the CANCEL
   request itself with a 200 (OK) response. 

The code as-is is what we really want.

RjS

On Apr 4, 2006, at 2:11 PM, Scott Godin wrote:

 
Currently in our UAS state machine if we receive a CANCEL after we have already sent a 200 to an Invite, then we just 200 the Cancel and continue to wait for the ACK.
 
The exceptional-procedures draft recommends in this case that we send a 481 response to the Cancel (since we are not processing it).  The UAC should then ACK our 200 and send a BYE to terminate the session.
 
I was considering change resip to follow the draft, so it will 481 the cancel instead of 200ing it.  What do you guys think the most correct thing to do here is?  A 481 may be a little miss-leading, since the dialog does in-fact exist.  Also a 200 is misleading, since we not going to cancel the transaction.
 
Scott Godin 
 
 

 
 800-410-1051 say my name
 905-882-5000 say my name
 icescape.com">slgodinicescape.com 
 www.computer-talk.com 
 
 
 
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