Hide Call History on Yealink IP Phones

[jolouis]

I'm not 3cx expert but that seems like a pretty basic dialplan/routing protection feature that should be present on the system without all the working around you're doing.

Have you re-read the documentation and contacted 3CX or your vendor to make sure that feature doesn't exist on the platform?

(Hint... google is your friend also:
Outgoing Call Restrictions)