Avaya IP 500
The IP500 control unit is best equiped for IP telephony applications due to its greater VCM channel capacity. The IP500 supports up to 4 PRI interfaces and 96/120 trunks.

Avaya IP 500 V2
The IP500 V2 is a new control unit which is an evolution of the existing IP500 and is fully backwards
compatible with it. The IP500 V2 operates in standard IP Office mode as well as a new Avaya IP Office Essential Edition PARTNER Version.

Avaya IP 406 V2 (Refurbished Only)
The IP406 V2 Office can support up to 6 expansion modules and 2 T1/PRI interface cards, which is 2x as much capacity as the IP403. It can be configured up to 180 digital or analog phone sets.

Avaya IP 406 V1 (Refurbished Only)
Supports 6 Expansion Modules providing a combination of up to 180 analog and digital extensions, with capacity for 8 analog trunks or 2 digital trunk (48 T1 channels or 60 E1 channels).

Avaya IP 403 (Refurbished Only)
The IP403 Office can be ordered in four trunk configurations Quad BRI, PRI (T1), PRI (E1) and Analog (loop start).

Avaya IP 412 (Refurbished Only)
The Avaya IP412 Office base unit supports up to 60 Trunks and 180 extensions and 12 expansion modules.