?? SIP (RFC3261, RFC2543)
?? Support IAX2 protocol
?? Support codec: G.711A/u, G.722,G.723 high/low, G.729i A/B
?? Support G.168 echo cancellation standard, compliant 96ms echo cancellation with speaker mode
?? Support voice volume adjustment, including IN/OUT of handset and speaker
?? Support Jitter Buffer, VAD, CNG, SIP, Domain name register, point-to-point Call
?? Support RTPi and RTCPi
?? Support the Inbound/Outbound transmission; SIP info, DTMFi Relay, RFC2833
?? Support many countries' standard ring
?? Support NATi: Support STUN, CITRON, AVS Mode
?? Support SIP domain, SIP Authentication (none, basic, MD5), Domain Name parse
?? Support two SIP server synchronously, including Pubic Server/ Private server, can make a call by any proxy. You can back-up and select any above SIP server.
??Support SIP application, including SIP Call forward/transfer/holding/conference/pickup/redial/unredial/joincall