The Polycom SoundStation Duo dual-mode analog/IP conference phone offers exceptional deployment flexibility and remarkable investment protection. Designed for small to medium-sized rooms, the SoundStation Duo is easy to set up and use. Furthermore, it offers Polycom's legendary audio performance. In VoIP environments, the SoundStation Duo conference phone ensures the industry's best standardized interoperability. Specifications: Support for both analog platforms and IP telephony Compatible with major SIP-based telephony standards and leading softswitch platforms 24/7 reliability with automatic switch-over from IP mode to analog mode Easy management as no boot server is required Microphone range up to 3 meters. Optional extension microphones can be added for better room coverage Polycom HD Voice technology 2.5 mm port for connection to a mobile phone or computer to make Internet calls