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IETF RFC 6913 - Indicating Fax over IP Capability in SIP
This RFC document, entitled "Indicating Fax over IP Capability in the Session Initiation Protocol (SIP)", authored by David Hanes, Gonzalo Salgueiro, and Kevin Fleming, defines and registers with IANA the new "fax" media feature tag for use with the Session Initiation Protocol (SIP).
Currently, fax calls are indistinguishable from voice calls at call initiation. Consequently, fax calls can be routed to SIP user agents that are not fax capable. A "fax" media feature tag implemented in conjunction with caller preferences allows for more accurate fax call routing.
This is now a Proposed Standard.