When call announcement is activated on an extension's forwarding number, your system will tell you which extension you are receiving a call from. Then it will give you the option to accept the call, send the call to voicemail, or listen to the caller ID information.
Call announcement is turned on or off within an extension's forwarding number settings.
First navigate to your extensions menu.
Select the "Edit" button on the extension where you wish to activate call announcement
Under the extensions forwarding numbers select the edit button on the number for which you wish to activate call announcement. Select "Calls will be announced when you pick up." under forwarding options. Remember to hit "Save & Close"