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
Full duplex hands-free speakerphone
NAT transverse: support STUN client
SIP support SIP domain, SIP authentication (none, basic, MD5), DNS name of server, Peer to Peer/ IP call
SIP support 2 SIP lines. Can connect to SIP1 and SIP2 server at the same time
DTMF: Support SIP info, DTMF Relay, RFC2833
SIP application: support Call forward/ transfer/ hold/ waiting / 3 way call/
Call control features: Flexible dial map, Hotline, Empty calling reject, Black list
for reject authenticated call, limit call, No disturb, Caller ID
Support Phonebook 500 records
Incoming calls / Outgoing calls / Missing calls. Each support 100 records
Support conference and MWI
10 kind of ring type
