Capacity: 8 Main Lines (Trunk Line/ P and T) and 56 Extension. Day/Night Mode(Manual), Music and Ringing Recordable OGM(outgoing message) Can be connected with Computer, Caller ID, Call Transfer, Call Forwarding Manually, Outgoing Call Transfer, Power Failure Transfer, Specific Main Line (C.O./Trunk Line) Dialing, Three Way Conference, Do Not Disturb, Auto/Manual Dial-Out Mode