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IETF ID - Indicating Fax over IP Capability in the Session Initiation Protocol (SIP)

This new IETF Internet Draft (ID), entitled "Indicating Fax over IP Capability in the Session Initiation Protocol (SIP)-- draft-hanes-dispatch-fax-capability-02 -- defines and registers with IANA the new 'fax' media feature tag for use with SIP. Currently, fax calls are indistinguishable from voice at call setup. Consequently, fax calls can be routed to SIP user agents that are not fax capable. A 'fax' media feature tag implemented in conjunction with RFC 3841 allows for more accurate fax call routing.