Enables standard phone or PBX connection to VoIP Services SIP protocol For family and SOHO use 2 FXS ports Ethernet ports: TWO* 100 Base-T Ethernet ports, Bridge/Router function Functions: Caller ID transfer, Call forwarding: Busy, No answer, Volume adjust, Ringer selection by caller ID Support features: Call hold/Retrieve, Call waiting, Call transfer, 3-way calling, Split 3-way calling, T.38 fax, Do Not Disturb Support IP inbound relay function(2 port use 1 account for incoming call) Support billing machine and get CDR Dimension:178*123*34mm (L*W*H)