This field controls calling party identification, that is, the extension of the primary telephone or the extension of the visited telephone that is used when a call is made from a visited telephone using the visited telephone dial pad. If you want the system to display calling party information of the primary telephone, the Send EMU Visitor CPN field must be set to y. There are areas where public network trunks disallow a call if the calling party information is invalid. In this case, there can be instances where the extension of the primary telephone is considered invalid and the extension of the visited telephone must be used. To Send EMU Visitor CPN display the extension of the visited telephone, you must set the field to n.