SIP/H.323/MGCP , POE optional ,1*WAN/1*LAN/1*WLAN optional (support ... WiFi ,802.11b/g), 1*SIM slot ,PPPoE/ADSL,NAT ,VOIP ... free talking, Volume adjusting, Ringing tone selection, Call ID, Phone book, Missing incoming call, Incoming call, Outing call.failed ... ;The Managment of customer purview. HIP1860(3) IP Phone SIP PHONE connect with Voip gateway