Starting with firmware 22.214.171.124, a new ActionURL trigger allows the phone to check if an incoming call number is blacklisted.
For each incoming call, the phone will send an HTTP request to a server with the caller number as parameter:
If the server answers with a 200 OK, the number is considered as blacklisted and the call will be silently rejected. If the server answers with an error, or if the requests times out (remote_blacklist_action_timer), the call is accepted.
The following settings play into this feature: