VVX 501 performance 12-line business media SIP phone with 3.5″ color touchscreen Up to 24 simultaneous calls 3-way audio conferencing Add video conferencing capability with VVX Camera (2200-46200-025) WebKit-based browser 2 USB ports for media and storage applications Polycom HD voice up to 14kHz on all audio paths Polycom Acoustic Clarity provides full-duplex conversations, acoustic echo cancellation, and background noise suppression