... optional (support WiFi ,802.11b/g), 1*SIM slot ,PPPoE/ADSL,NAT ,VOIP Ethernet Interface:1-2 *10/100Base-T;Calling ... and comfort noise generation.Agility AccessSupport IP special telephone line, ADSL LAN Cable Modem;HIP1860(3) double Ethernet model support NAT ... purview. HIP1860(3) IP Phone SIP PHONE connect with Voip gateway