The Private Call feature is used to prevent any intrusions during the call. Private call can be activated either before or during a call and will set the phone status to 'cannot be intruded' until you switch the Private Call feature off.
If you place an intrusive call to an extension with Private Call on, you will hear the Number Unobtainable tone.
Note
•Private call is not a default feature. If you require this option, contact your administrator.