For that matter, is anyboy using 'ST Datagram', or is v5 also
recoverable for re-use?
According to IEN 119 -- ftp://ftp.isi.edu/in-notes/ien/ien-119.txt.1
-- of 7 September 1979:
] The state of the protocol is such that, while there are
] still details to be worked out, implementation could begin if the
] protocol were acceptable to those interested.
I could find no further mention of the protocol.
Most of its proposed functions seem to have been implemented by RTP,
H.323, and various and sundry QoS implementations for telephony and
synchronous-only VOIP. ST must have stood for 'Stream Telephony'.
IANA: Unless you can find some evidence of implementation, please
retire the IP protocol number 5 assignment as Historical.
Cheers,
James