gnugk(1) on Linux
The text f0d61216fa1b, as Debian 4.0 (Etch) shipped it.
Open H323 Gatekeeper - The GNU Gatekeeper
Flags it lists
-
--direct -
--h245routed -
--output -
--routed -
--trace -
-d -
-o -
-r -
-rr -
-t