Support SIP and MGCP protocol DHCP support for LAN or Cable modem PPPoE support for ADSL or Cable modem with ROUTER build in Audio codec G.711 , G.726 , G.723 , G.729 CALL waiting,Hold,Transfer 3 way conference Set by HTTP web browser (IE6.0) or Telnet VAD(Voice active detect) CNG (Comfort noise generation) G.168/165 compliant 16ms echo cancellation Adaptive Jitter Buffer Packet Loss Compensation T.38 FAX protocol Power adapter: 110V~240V input,switching power adapter. Network interface:2 RJ-45 Ethernet connectors 1 FXS lines for Telephone(POTS) 1 RJ11 for PSTN passthrough Unit Dimensions：125mm × 105mm × 33mm(5.0in × 4.3in × 1.2in) Box Dimensions：245mm × 130mm × 55mm(9.6in × 5.2in × 2.2in)