[Features] 8FXS/8FXO/4FXS+4FXO/16FXS/16FXO/8FXS+8FXO/12FXS+4FXO, continuous choice supported H. 323 or SIP protocol supported PPPOE/DHCP/static IP supported Codec: G. 711A-/U-law, G. 723. 1/AG, 729A/B VAD and G. 168 (25-64MS) Intelligent routing, power-off protection; T38, T30 and FRF supported Caller ID checking and displaying supported FSK and DTMF check and generate Busy tone parameter self-adaption CNG(Comfort Noise Generation) and value adjustment supported Polarity reversal billing provided Voice record and IVR Programmable Remote management, upgrade and maintenance [Specifications] Unit weight: 5.1KG Unit dimension: 440X330X44mm