- Polycom HD Voice technology for high-fidelity calls at up to 22 kHz – An industry first, a VoIP conference phone that sounds as natural as being there. - Patented Polycom Acoustic Clarity™ technology delivers the best conference phone experience without compromise. - 20-foot (7-meter) microphone pickup range, and even greater distances with optional expansion microphones or multi-unit connectivity to reach all corners of the conference room. - Flexible configuration options – Multi-unit connectivity, expansion microphones, and integration with Polycom HDX solutions to meet the needs of many different types of rooms. - Ideal VoIP conferencing platform – leveraging the most advanced SIP conferencing endpoint software in the industry, with advanced call handing, security, and provisioning features. - Robust VoIP interoperability – Compatible with a broad array of SIP call platforms to maximize voice quality and feature availability while simplifying management and administration. - Resists interference from mobile phones and other wireless devices while delivering clear VoIP conferencing with no distractions. - Large high-resolution display with XHTML microbrowser enables new applications that make conference calling easier and more functional. - Applications Port connects to mobile phones for dialing from rooms without an analog phone line, and connects to a PC to become a high-quality conference phone for Internet calling.