Compatible with standard SIP (RFC3261) protocol and main IPPBX/IMS platform. All-in-one wall-mounted design, integrated with network audio codec, digital amplifier amplifier and speaker. Noise Reduction - The embedded processing module reduces environmental noise and improves voice recognition up to 5 meters (approx. 16 feet). Built-in high fidelity speaker. Online adjust volume output. The built-in audio output interface to connect external active speakers. Standard RJ45 port, the Ethernet front-end ports where you can access, support across different network segment and routing. Adaptive output power according to the power supply voltage.