Section 700 - Operation
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Version 4.0 or higher)
FF3 (Extension): Extension Class of Service Assignment (CPC-AI1 and
CPC-B Version 4.0 or higher)
Callback Queuing will ring an extension in DND.
A Private Line will ring an extension in DND.
In CPC-A and CPC-B Versions prior to 5.0, DND and Absence Messages
cancel Call Forwarding.
Beginning with Version 5.0, calls to an extension with DND or Absence
Message turned on are treated differently, depending on whether they are
trunk or intercom calls. Intercom calls receive busy tone; trunk calls are *
routed to the extension defined in permanent call forwarding.
The following types of incoming trunk calls will follow permanent call
With CPC-A and CPC-B Version 1, DND is not available for Attendant
Phones. Beginning with CPC-B Version 2.0, Attendant Phones can activate
The Attendant can activate or cancel this feature on an extension using FF
key LEDs on a DSS console.
The DND feature cannot be activated from an extension selected to receive
Chapter 4. Key Telephone Features