It enables/disables the call to be considered as "private":
Private Calls
Release 4.0+: This feature allows users to mark a call as being private.
When on, any subsequent calls cannot be intruded on until the user's private call status is switched off. The exception is Whisper Page which can be used to talk to a user on a private call.
Note that use of private calls is separate from the user's intrusion settings. If the user's Cannot be Intruded (User | Telephony | Supervisor Settings) setting is enabled, switching private calls off does not affect that status. To allow private calls to be used to fully control the user status, Cannot be Intruded (User | Telephony | Supervisor Settings) should be disabled for the user.
Use of private calls can be changed during a call. Enabling privacy during a call will stop any current recording, intrusion or monitoring. Privacy only applies to the speech part of the call. Call details are still recorded in the SMDR output and other system call status displays.
• Button Programming
The button programming action Advanced | Call | Private Call can be used to switch privacy on/off. Unlike the short code features it can be used during a call to apply or remove privacy from current calls rather than just subsequent calls. On suitable phones the button indicates the current status of the setting.
• Short Codes
A number of short code features are available for privacy.
• Private Call
Short codes using this feature toggle private status on/off for the user's subsequent calls.
• Private Call On
Short codes using this feature enable privacy for all the user's subsequent calls until privacy is turn off.
• Private Call Off
Short codes using this feature switch off the user's privacy if on.
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