> When sending a BYE method to a SIP server, the returned 
> response status code is 480. Could you please tell me why?

The following is an RFC 5057 snippet which indicates that it unclear why 
someone would return such a response.  Thus you'd likely need to ask the vendor 
concerning why they are sending it.

"(7) 480 Temporarily Unavailable:  RFC 3261 is unclear on what this
   response means for mid-usage requests.  Future updates to that
   specification are expected to clarify that this response affects
   only the usage in which the request occurs.  No other usages are
   affected.  If the response included a Retry-After header field,
   further requests in that usage should not be sent until the
   indicated time has past.  Requests in other usages may still be
   sent at any time."  


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