User Interface: 8–32 FXS
Physical Interface: 1 WAN, 3 LAN, 1 Serial Interface
Protocols supported: SIP , MGCP
Audio Features: G.711 (A-law and μ-law), G.729, VAD, CNG, PLC, EC (G.168), jitter buffer, gain control, anti-jitter delay, and three-way calling
