According to RFC 2026 historic RFCs are those whose
specification has been superceded by a more recent specification.
RFC 4612 is labeled historic, and defines a MIME type
for T.38 over RTP, a practice that is just now being adopted
and to be encouraged.
Indeed, the RFC discusses limitations of UDPTL,
but it does not suggest deprecating its use.
In any case the subject of the RFC is the RTP mode,
and not UDPTL.
So why the "historic" designation?
Y(J)S
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