From: Mihaly Zachar <[EMAIL PROTECTED]>

   The UAS has a feature, that if the called number is matching with a 
   pattern, it will send 183 Session in progress, than plays an RTP stream 
   and then redirect the UAC with 302 Moved Temporarily..

   There is an UAC, and it's developers says that I should not send 302 
   Redirect after the 183 Session in progress.

I believe the developers are incorrect.  In RFC 3261, section 13.1,
top of page 78, we see:

   After some time, those UASs can accept the invitation (meaning the
   session is to be established) by sending a 2xx response.  If the
   invitation is not accepted, a 3xx, 4xx, 5xx or 6xx response is
   sent, depending on the reason for the rejection.  Before sending a
   final response, the UAS can also send provisional responses (1xx)
   to advise the UAC of progress in contacting the called user.

   After possibly receiving one or more provisional responses, the UAC
   will get one or more 2xx responses or one non-2xx final response.

This text implies that a provisional response may precede a non-2xx
final response.

Dale


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