[Features] 1FXS, 1line port for PSTN life-line function One 10/100M Ethernet port for WAN H. 323 or SIP protocol Codec: G. 711A-/U-law, G. 723.1/AG, 729A/B Diffserv, SNTP(SIP version), CNG. TOS. JITTER BUFFER, VAD Intelligent routing, power-off protection; T38, T30 and FRF supported Caller ID checking and displaying supported Busy tone self-learning Remote management, upgrade and maintenance [Specifications] Unit weight: 200g Unit dimension: 113X80X27 mm