Abstract: A system that associates a particular called number with a particular telephone number on an MDN line. An association table is established which associates particular called numbers with particular numbers on the MDN line. Thereafter calls from the MDN line to any number in the association table results in the call being identified as being from the MDN number associated with the called number in the association table. That is, after a particular called number is associated with a particular MDN number, calls from the MDN line to the particular called number are identified as being from the associated the MDN number. If a called number is in the Association Table, call from that number can be associated with a particular MDN number to provide a distinctive ring tone or other special features.