Setup Anonymous Call Rejection
This article provides instructions on how to block anonymous calls.
Block "mystery" calls from anyone whose caller ID information is blocked. The caller will automatically receive a message that you are not accepting caller ID-blocked calls and will be advised to unblock their number and to try the call again.
To Activate: Lift the handset, listen for the dial tone, then press *77.
To Deactivate: Lift the handset, listen the for dial tone, then press *87.