The Avaya 1616 IP Telephone for IP Office or ACM 700450190 is compatible with both the IP Office platform (Avaya IP500) and the Communications platform, the Avaya 1616 includes the features found only in higher end, more expensive, enterprise class Telephones. The Avaya 1616 features include a Headset Port - Choose your Headset Here a bright, backlit display, support for multiple call appearances, 2 way speakers, dual lamp LEDs, fixed feature keys, and a context sensitive user interface with soft keys.