Advanced Hybrid Telephone System Initially configured for 3 COs, 8 stations Can expand to a maximum configuration of 6 COs, 24 stations Dual Port Usage allows you to connect a Panasonic proprietary phone and a single-line device simultaneously to any extension port Caller ID compatibility displays the incoming caller's phone number or name when used with a Panasonic proprietary display phone. Up to 20 calls can be logged per extension. Flexible CO Line Buttons Automatic Redial Proprietary Cordless Phone Integration Single Line Device Integration allows you to connect answering machines, cordless phones, fax machines and modem without additional cards or wiring DISA with Fax Detection and OGM provides callers with single-digit access to extensions or ring groups. Also detects CNG tones from incoming fax calls and automatically transfers them to the designated fax extension Station Message Detail Recording (SMDR) Toll Restriction Voice Mail Integration lets you connect a Panasonic KX-TVS Series Voice Processing System without software or hardware upgrades 4 Door Intercom & 4 Door Opener Interfaces Day/Night/Lunch Service