• 16 arrayed microphones with high voice capturing capability
• 4 speakers with high voice reproduction capability
• High-performance adaptive echo canceller by Yamaha
• Wideband voice codec technology for high fidelity audio (G.722)

FEATURES
• Arrayed microphones (directivity controlled)
    - Zone audio pickup function
    - Spot audio pickup function
• Call history (50 calls), Address book (16 SIP addresses, 50 PSTN addresses)
• Web GUI, Auto/manual F/W update, Password protection, Syslog support
• PSTN: DTMF and pulsed line support, hook time control
• Audio Device mode support, External audio support, 
    - Daisy chain expansion
    - Standard SIP compliance
    - DHCP and static IP support, Time synchronization using the SNTP server (Time zone setup, SNTP interval setup)
• Echo length control (Room size = Large/Medium/Small), Silence suppression
• Natural Voice Enhancer feature (high frequency boost)
• MIC/audio-in/audio-out gain control
• Ring tone volume control
• Speaker volume control