RDP is still in use
was the initial transport used for gateway control (such as SGCP) until
SCTP was developed.
Many commercial gateways still support these older pre-standard (to
MEGACO) control protocols. Some older devices still provisioned in the
network only support the older protocols.
but we had nothing before SCTP that would fit the bill. Its limitations
was one of the driving forces behind developing SCTP.
So RDP is a useful and deployed pre-standards protocol that was one of the
driving forces behind a successful standardization effort. But newer
applications that need that kind of transport instead use the standard,
SCTP.
I don't know how one could possibly make a stronger case for classifying the
RDP spec as Historic!
However, I do agree with John Klensin's remark that reclassification is not
worth the energy it takes.
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