... Calling Control Protocol:H.323,MGCP,SIP;Network Protocol:TCP/IP/UDP/ARP/ICMP/HTTP/RTP/RTCP ... silence restrain and comfort noise generation.Agility AccessSupport IP special telephone line, ADSL LAN Cable Modem; ... , Volume adjusting, Ringing tone selection, Call ID, Phone book, Missing incoming call, Incoming call, Outing call ... of customer purview. HIP1860(3) IP Phone SIP PHONE connect with Voip gateway