Voip gateway Ieee 802.3 10 base tsupport dhcp, pppoe dns telnet Support g.711a/ug.723.1, g.729 /a/b/ab and gsm610 voice codec Sip, h.323 v4 protocalsip rfc3261support http, https, ftp upgrade Tcp/ip: internet protocalsupport rtp rtcp protocal Support vad/cngone wan, one lan, support router Call forward (always, busy, no answer), call waiting and per call-waiting blocking Caller number/name display caller id /block outgoing caller-id/reject anonymous call A voice activity detection (vad) facsimile protocol(option): t.30/t.38 Voip speed dial, voip digital mapper area ring tone supportdnd(do not disturb) mwi G configurable/adaptive jitter buffer sizesupport vlan protocalsupport web, ivr to configur