Your system is designed to have an alternate mode ofoperation generally designated as Night Service. NightService permits incoming calls to ring differently thanduring normal Day operation.Night Service may be set manually or automatically.M an ual Nigh t S erviceKeyphone1. Press [NIT] to enter Night Service, if the buttonis programmed.2. Press [NIT] again to enter Day Service.Au tom at ic Nigh t S erviceAutomatic Night Service is turned on or off according toprogrammed on and off times.These times use the system clock as a reference, so thesystem clock must be set correctly.Pressing [NIT] will override the automatic mode until thenext programmed time.There are several timetables of automatic night service.Refer to the Programming section of the Technicalmanual. ( M M C 56)SPECIAL FEATURES54Night Service