Model 9610, the "walk-up" phone, is designed for lobby or conference room use, with a big screen and an application that will allow IT to run a phone directory through the desktop phone.

Model 9620, the "everyday user" phone, is a scaled down phone designed for "non communication-intensive tasks," said Saied Seghatoleslami, vice president of product management at Avaya.

Model 9630, the "essential user" model, is designed for those who are constantly on the phone. This model will include more of the management features associated with VOIP phones such as conference calls, alerts, and call prioritization. These phones will include the ability to transfer a call in progress from a cell phone to the desktop VOIP phone and back with a single push button.

Model 9650, the "navigator" phone, is for workers, such as an administrative assistant, who manage calls.

The real key to these phones success in the enterprise will be their improved voice quality and modularity, said Frank Dzubeck, president of the industry analysis firm Communication Network Architects.