Title: The Reason Header Field for the Session Initiation Protocol (SIP)
Author(s): H. Schulzrinne, D. Oran, G. Camarillo.
Status: PROPOSED STANDARD
Date: Dec 2002
Length: 15695
For creating services, it is often useful to know why a Session Initiation Protocol (SIP) request was issued. This document defines a header field, Reason, that provides this information. The Reason header field is also intended to be used to encapsulate a final status code in a provisional response. This functionality is needed to resolve the "Heterogeneous Error Response Forking Problem", or HERFP.
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