Specifications:
1) D1 high resolutioned and realtime network video server, compativle
    to half D1,CIF,QCIF
2) Adapt latest MPEG video code technology and G723.1 audio code technology
3) Supports PAL/NTSC
4) Built-in web server. Web page realizes remote monitoring, controlling
    and setting
5) Equipped with function of secure remote upgrading
6) Support PPPoE, DHCP dynamically configurable IP address
7) Realtime transmission of bidirectional voice dialogue
8) Support 20 users Simultaneous visit
9) With 16Kbps to 5Mbps of video bitrate, continuously selectable and 1-30
    (1-25)of framerate, continulusly selectable
10) Video mask, motion detection, probe alarm (zone and sensitivity can be set)
11) RS-485 serial port, support transparent serial transmission, and external
    devices like PTZ controlling and high speed dome camera or camera
12) Abnormally automatic recovering function. Able to connect automatically
    after the internet gets offline