Support IAX2 and SIP RFC3261 synchronously
Codec: G.711A/u, G.7231 high/low, G.729
Echo cancellation: Support G.168, and Hands-free can support 96ms
Support Voice Gain Setting, Jitter Buffer, VAD, CNG, dual GK, call forward, and Peer to Peer
NAT transverse: support STUN client, Citron, AVS
SIP support SIP domain, SIP authentication (none, basic, MD5), DNS name of server, Peer to Peer
SIP support Pubic & Private server. Can connect to ISP and Private SIP server at the same time
SIP support dual public server
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