Business class phone works with RCA® VoIP phone service (sold separately). Receive consecutive incoming calls with the multiple line appearances. Full duplex speakerphone with HD voice. Its Caller ID memory can store up to 100 names/numbers. Easily expand by adding as many phones and lines as your business requires. Digital Receptionist (auto attendant) is fully customizable and helps direct your callers quickly and easily to any extension. Dial by name directory. Call logs will detail reports by user, number called, date & time, duration and call type. Music on hold is customizable from multiple selections. The visual phone ringer will flash notifying you of incoming calls.