Hi @kkedem - we implemented the typology list as you mentioned. This was fine but had to be managed for any new numbers on the "allow" list.
One other thing we did on our non-prod environments was to invalidate the mobile of any recipients we didn't want to contact. On our daily data import, we just appended some invalid numbers to all phone numbers and this basically blacklisted any numbers we didn't want to contact.
Cheers
Darren