If I launch an app containing a call directory extension, then with earlier betas it would get enabled (in the settings control panel) automatically.
However this no longer seems to be the case with 10.3. AFAICT the only way to enable it is for the user to do so manually by the setting control panel.
If this is the intended behaviour, then the call directory extension is now a very useless piece of functionality , unless either a) the app can request the user to enable the extension (as it does for things like contacts access, location etc.) or the app can launch the relevant control panel settings in a view controller so the user can enable it. Howeve neither of these is apparently possbile).
I know Apple have been reading and responding to some of the call directory extention threads in this forum, if you are reading this, are you able to comment on the situation regarding enablement of the extensions?