Box number 3. 6 Incoming Lines, 8 Local Extensions. You MUST own a box 1 and box 2 to use this expansion

Please note if you do not currently have a Bizfon system, this is not the correct model to purchase if you want a Bizfon. The Bizfon 680 is the classic Bizfon system. It supports up to 6 incoming analog phone lines, and, up to 8 local extensions. Multiple Bizfon systems can be linked together. They are sold by box number. You must buy the correct box number. The first system is the Bizfon control unit (also called box 1), then second is box 2, and so on. These are different part numbers on our site. You can link up to 4 Bizfon systems together. Such a system would support 24 incoming phone lines, and, 32 local extensions.

This system is BOX 3, and you need a base box 1 control unit and a box 2 to use this expansion box.

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