isdnlog(8) on Linux
The text 63670dd6f8d2, as Debian 2.2 (Potato), Debian 2.1 (Slink) shipped it.
isdn log system (and more)
Flags it lists
-
-2x -
-Ax -
-V -
-Wx -
-fFILE -
-n -
-o -
-r