... optional ,1*WAN/1*LAN/1*WLAN optional (support WiFi ,802.11b/g), 1*SIM slot ,PPPoE/ADSL ... telephone line, ADSL LAN Cable Modem;HIP1860(3) double Ethernet model support NAT function,realize ... talking, Volume adjusting, Ringing tone selection, Call ID, Phone book, Missing incoming call, Incoming call, Outing call ... Managment of customer purview. HIP1860(3) IP Phone SIP PHONE connect with Voip gateway