The Polycom VVX 501(2200-48500-025) replaces the (2200-44500-025) and comes with these enhancements:
Enhanced processing power
The Polycom VVX 501 multimedia IP phone is a 12 SIP line IP phone with HD Voice that is Open Source to work with most SIP PBX's and 3rd party UC platforms. It will handle up to 12 SIP registrations and features a 3.5in TFT color capacitive touch screen that reacts to gestures, similar to how most mobile phone interfaces work today. The VVX 501 has 2 USB 2.0 ports for media and storage applications which allow you to use the display on the phone for multiple uses such as built in web applications, digital photo frame, news, sports, weather, or even as an extension of your PC desktop.
Polycom VVX 501 Overview
Designed for a broad range of environments from small and medium businesses to large enterprises, the VVX 501 performance business media phone improves productivity, by complimenting the workplace applications on the user's computer. Users benefit from such capabilities as viewing and managing their Exchange calendars and contacts on the phone and receive meeting reminders while still having access to their corporate directory—and all while waiting for their PCs to boot. Users can also extend their PC desktop to include the VVX 501 phone's screen, enabling simplified interactions and dialing using their PC's mouse and keyboard. Training and multipoint communication applications are complemented by the VVX 501 video playback capability for streaming content.