This object is used to add or delete a phone number from the PhoneNo list of a port. Each phone number and its associated attributes (phone type, Baud rate, and priority-position) is containned in a row. When adding a new phone number, only the createAndGo method of adding row is supported. All essential elements of the row must be specified in the same SET request PDU. They are: phone number(a3ComPortDialPhoneListPhoneNo), phone number position (specified by the instance identifier of a3ComPortDialPhoneListPos), and the port number (specified by the instance identifier of a3ComPortDialPhoneListPort).