The Avaya IP Office phones come in digital and IP versions. These phones are designed for the Avaya IP Office phone systems and servers. The Avaya IP Office phones are compatible with Avaya G series of media gateways. Dotcom Computers carries the 1400, 1600, 2400, 4600, 5400, and 9600 series phones. These digital and IP phones connect to systems both small and large.