SIP, IAX2, PPPOE, STUN
Key Features
•  Support IAX2 and SIP RFC3261
•  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
•  DTMF: Support SIP info, DTMF Relay, RFC2833
•  SIP application: support Call forward/transfer/holding/waiting
•  Call control features: Flexible dial map, support Hotline, Empty calling No. Reject service, Black list for reject
....authenticated call, No disturb, Caller ID.
•  Support conference call and voice record
•  English, Spanish, Czechoslovak alternative
•  WAN/LAN: Support Bridge and Router model