Support SIP 2.0 (RFC3261) and correlative RFCs Codec:G.711 A/U Law, G.723.1, G.729a/b, G.722,G.722.1, G.726 Echo cancellation: Support G.168, and Hands-free can support 96ms, Hand free Speaker Phone Support Voice Gain Setting, VAD, CNG DTMF:Support SIP info, DTMF Relay, RFC2833 Full duplex hands-free speakerphone Support 2 SIP lines. Can connect to SIP1 and SIP2 server at the same time SIP application: support Call forward/ transfer/ holding/ waiting /3 way talking/paging and intercom/pickup/join call/click to dial/call back SIP support SIP domain, SIP authentication (none, basic, MD5), Peer to Peer/ IP call Call control features: Flexible dial map, Hotline, Empty calling reject, Black list for reject authenticated call, limit call, No disturb, Caller ID NAT transverse:support STUN client Incoming calls / Outgoing calls / Missing calls. Each support 100 records Support Phonebook 500 records Support conference 10 kind of ring type Support SRTP Support MWI |