1401-09: Receive DID Camp-On
Use this option to enable or disable the ability of a DID call to Camp-On to the extension when it is
busy. If enabled, a DID call to the extension will Camp-On for the 1601-02: DIL No Answer Timer. If still
unanswered, the call will divert to Key Ring. If disabled, the incoming call will not Camp-On and the caller
will hear busy tone.