RetroNetCall: "ISDN B-Channel protocols"

I've presented about
ISDN B-Channel protocols (X.75, V.120, V.110, T.70, ...)
as part of the

Many people with some kind of telecom background are familiar with D-channel (signalling) protocols of ISDN, and you can find many publications on that topic. Surprisingly, much less publications are talking about the B-channel protocols used for data transmission, like VX.75, V.110, V.120, T.70, ...