When the privacy button is configured with a phone enabled for privacy, shared line privacy can be interactively enabled or disabled by the user. When the phone has privacy disabled, this button has no effect.
To enable Barge (not cBarge, which uses conference resources), the built-in bridge must be enabled. This is set globally (CallManager Service parameters) and overriden at the phone. The default is for the built-in bridge to be disabled.
From a user perspective, to activate the remote-in-use state, when a shared line is in use on Phone A, the line on Phone B will indicate that a call is in place. Assuming Single-line Barge or Single-line cBarge are disabled, pressing the shared line on Phone B activates the Remote in Use state (the default Single Line Barge setting is Off). Barge can then be selected. Privacy is important - if Privacy is enabled on Phone A, Barge can not be enabled.
Single line barge is controlled using CallManager Service Parameter, Single Button Barge/CBarge ...
The Privacy button allows the end user to toggle privacy on and off. If privacy is on, the Barge and cBarge keys can never be used, since the Remote-in-Use state cannot be selected. If the Phone Privacy setting is On (default), the Privacy button should be assigned to a phone button template if Barge is required, which in turn is assigned to a device (or UDP).
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