Specification: 1.Standard and Protocol 2.Dual Modes switch, the user can choose "IP first", "PSTN first" or "disable". If choose "disable", the phone can receive IP Phone call in and PSTN Phone call in, but it cannot make PSTN call 3.Support SIP,H.323 v4,MGCP,IAX2,net2phone etc protocol 4.DHCP support for LAN or Cable modem 5.PPPOE support for ADSL or Cable modem 6.Set phone by HTTP web browser (IE6.0) or Telnet 7.Upgrade by FTP 8.Support G.711 a/u, G.723.1 5.3/6.3, G.729A/B/AB/ gsm610 9.Dynamic voice test 10.CNG (Comfort noise generation) 11.G.168/165 compliant 16ms echo cancellation 12.Tone generation and local DTMF re-generation according with ITU-T 13.E.164 dial plan and customized dial rules