How does the Advanced Call Blocking system work for unknown callers?
For calls from numbers not on your contact list or block list, the Advanced Call Blocker asks the caller to say their name. It then lets you decide whether to accept or block the call without having to speak to the caller directly. (Page 1)
From the official BT Bt4600 manual, page 1
Have a follow-up question?
Answers from the official manual.
Common questions