From: "Tang Xi" <[EMAIL PROTECTED]>

   1) UAC sends a REFER to UAS
   2) UAS sends a 202 response back and do the reference, but doesn't send
   NOTIFY with 100 trying
   3) After some seconds the UAC terminates the REFER application, cause it's
   timer out

   Is the behavior of UAC correct?

The UAS is, of course, not behaving correctly.

What the UAC discovers is that it is not going to receive updates
regarding the progress of the REFER.  (Which could happen legitimately
if the UAS sent the initial NOTIFY with expires=0.)  What the UAC does
when the subscription is terminated before delivering a final status
of the new INVITE needs to be considered by the application designer.

Dale
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