X.25 Call User Data for higher level protocols

Greg Satz (satz@clash.cisco.com)
Wed, 3 Feb 88 12:56:48 PST

I am in need of the protocol identifiers used in the CALL USER DATA
field of the X.25 CALL REQUEST packet for various higher level
protocols. I believe I know the following information but need to be
able to fill in the blanks. Can anyone help or provide a reference as
to where I might find this data?

Who supplies these numbers? ISO? I would like to define an ID for a
virtual circuit that includes an extra 16 bit data field that could be
used like the ethernet type field. Has something like this already
been defined? Should I be using 802.2? Comments?

                Protocol Call User Data (byte in hex)
                -------- --------------

                    PAD 0x01
                     IP 0xCC
                 ISO IP 0xCD
                    XNS ??
                    PUP ??
                 DECNET ??
                  Chaos ??


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