Paul Hayton (fsxNet admin) had this idea. This seems to do the trick.
It does use the listed IBN (BinkP) address as a fall-back if the INA and ITN addresses aren't specified, which may not be desireable.
So maybe that should be a command-line option to enable as desired. <shrug>
From Rob Swindell (on Debian Linux) to Git commit to main/sbbs/master on Thu Feb 16 22:13:00 2023