SL2100 chassis and CPU combo package with 4 port 2 hour voicemail system built-in and 8 VoIP channels. Can be expanded up to 108 Co lines and 128 extensions. This kit also includes cards to expand initially to 3 Co lines, 8 digital stations and 2 analog stations. Also included are 4 be117451, 12-button digital phones and an installation cable.