Key features: SIP and IAX2 protocol STUN Jitter Buffer(200ms),VAD,CNG G.711 a/u and G.729 codec G.167 16ms Acoustic Echo Canceller echo cancellation, 64ms in handsfree mode Inband audio，RFC2833 and SIP info DTMF transmission method SIP Call Forward、Call transfer、Call hold、Call waiting, 3-way Talking、Pickup、Join call、Redial、Unredial、Call Park Hotline , DND (Do Not Disturb) , black list , call limitation , caller ID Dial-peer calling rules and point to point call by IP address SIP server conference AES 64bit SIP signal encryption Auto answer
Data Features: Static/Dynamic Wan-IP-Address PPPoE
Management： Config with Web , keypad and Telnet Update firmware and configuration via HTTP , FTP and TFTP Support auto provision Support syslog Support config server management Guest and admin password changeable Phonebook support 500 records , and 100 missed calls and call history
Interface： Two RJ45 ports, one for WAN, one LAN. Power port
