Automatic Attendant Service The caller press the dial number directly and connect with the extension according to the guidance message without the operator. M.O.H. (Music on Hold) You can record the music for M.O.H. and use them on your PBX system. Day / Night / Holiday mode You can select the mode for day / night / holiday by pressing the button simply. The mode is selected automatically on the appointed time. ARS recording system and Non- volatile memory You can record the message simply with the cassette player. The message is stored non-volatile memory.