Astounding voice quality and clarity from the world's most advanced IP conference phone. Polycom HD Voice™ technology for high-fidelity calls at up to 22 kHz An industry first, for conference calls that sound as natural as being there. Patented Polycom Acoustic Clarity Technology delivers the best conference phone experience with no compromises. Flexible configuration options Multi-unit connectivity, expansion microphones, and future integration with Polycom HDX solutions to meet the needs of many different types of rooms. Strong, robust SIP software leverages the most advanced SIP endpoint software in the industry, with advanced call handing, security, and provisioning features. Robust interoperability Compatible with a broad array of SIP call platforms to maximize voice quality and feature availability while simplifying management and administration.