Voice privacy
Note: Availability of this feature depends on your
arrangement with your service provider and the
network’s ability to support the feature.
Some service provider’s networks can encrypt the signal
transmitted during a phone call to ensure others are
unable to listen to your conversation. By default, the
voice privacy setting on your phone is set to Off. To turn
it on, press Menu 4-4-1 (Settings - Network services -
Voice privacy). Scroll to On, then press OK.
During a call, if voice privacy is lost, your phone sounds
two short beeps.