I am in trixbox 18.104.22.168 which has FreePBX22.214.171.124. I am in useranddevice mode.
One device is an adhoc extension. When this device is log off and when I use this device to all one of the DIDs on the trixbox, the call will be rejected. The VOIP provider told me he saw a “403” error code for the refusal.
If I use another extension which is associated with a User on the trixbox system to call, then calls always go through.