Computer call back and the 'ct' command

[Jonathan S. Shapiro]

ct(1) is part of the System V basic networking utilities package (i.e.
uucp). The best one is part of the HoneyDanBer uucp, which is
distributed in SVR3.0 and later (not sure about earlier releases). If
you have a System V license, you have the source, but you will need to
run HoneyDanBer uucp, as tehy are really an integrated package.

Jon Shapiro