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Voice Features
• 4 Port FXS Gateway
• Support SIP RFC3261 /IAX2
• Codec：G.711A/u，G.7231 high/low，G.729
• Echo cancellation：Support G.168
• Support Voice Gain Setting, Jitter Buffer，VAD，CNG
• 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 dual public server
• 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 T.38 Fax