Voice Functions and Features Support SIP 2.0, H.323, Lifeline Codec: G.711A/u, G.7231 high/low, G.729 Echo cancellation: Support G.168 Support Voice Gain Setting, Jitter Buffer,VAD,CNG, and Peer to Peer NAT transverse: support STUN client Support SIP domain, SIP authentication, DNS name of server Support two sip server at the same time DTMF: Support SIP info, DTMF Relay,RFC2833 SIP application: support Call forward Digital Radio Call control features: Flexible dial map, Reject service, Black list, out-limit, No disturb Network Functions and Features WAN/LAN: Support Bridge and Router model Codec: G.711A/u, G.7231 high/low, G.729 Support PPPoE for xDSL Support DHCP Client on WAN Support DHCP Server on LAN Support DNS Relay, SNTP Client, Firewall, route, telnet client Support two sip server at the same time DTMF: Support SIP info, DTMF Relay,RFC2833 SIP application: support Call forward Digital Radio Call control features: Flexible dial map, Reject service, Black list, out-limit, No distur Maintenance and Management Support Boot Monitor Can upgrade firmware through boot monitor Can config through Web, Telnet Can upgrade firmware and configuration file through HTTP, FTP, TFTP Support Syslog Maintenance DECT Features Digital Stand Caller Memories and phone book Handfree 120 hour standby time PSTN call is default