TELEPHONE ACCESSORY AND TELEPHONE ANSWERING MACHINE ACCESSORY DEVICES; COMPRISING WALL PLATES, WALL MOUNDS, JACKS WITH WIRING BLOCKS, DUPLEX JACKS, CORD COUPLERS, EXTENSION CORDS, COIL CORDS, CONVERSION CORDS, MESSAGE CASSETTES, ANNOUNCEMENT CASSETTES, ADAPTERS, ADAPTER PLUGS, TELERECORDERS AND ANSWER OFF DEVICES