Avaya 5420 - Manual (Page 19)

Basic Call Handling Features
2420 and 5420 User Guide Page 15
IP Office 4.0 15-601077 Issue 8 (11th December 2006)
Private Call
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 a 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.