Polycom SoundStation Duo Unparalleled voice clarity: Polycom HD Voice technology makes your IP conference calls more effective and productive Robust interoperability: Compatible with a broad array of IP call platforms to maximize voice quality and feature availability while simplifying management and administration Superior call handing, security, and provisioning: Leveraging the most advanced IP endpoint software in the industry Built-in investment protection: Use in analog or IP mode and keep it up-to-date with simple online software upgrades Business continuity: Auto failover from IP to analog and failback for continuous operation in case of a network failure