Features: 1.Open soure Asterisk 2.uClinux Operation System 3.Configurable IVR meue 4.Over 50-100 avilable SIP/IAX2 extensions for SMB use 5.20 concurrent calls 7.Call Forward , Call Waiting , Call Trandfer (Blind Transfer/Attendr Transfer), Call Pickup/ Call Parking , Call Queues, Ring Group Call Detail Record Call Routing 8.Conference Room 9.Password Protect for Conference Room 10.Follow Me 11.Music On Hold 12.Skype for SIP 13.SIP Trunk, IAX2 Trunk , PSTN Analog Trunk 14.Configuer via WEB interface 15.Code:G.711u/a, G.729, GSM, Speek, G.726 16.Full SSH access 17.vpn support N2N 18.FTP 19.DDNS 20.FAX Specifications: Hardware .CPU: 400MHz Blackfin 532 Chip .Flash: 256 MB .SDRAM: 64MB .LED .Programmable Reset Button Module configuration .Slots for modules : 2 .Dual port XO: XO-02 .Dual port FS : FS-02 Interface .2 X RJ45 port .1 X Power port .1 X UART interface .1 X MMC/SD slot .2X RJ11 port (FS/XO interchangeable) Electrical .Power Input:DC 12V/1A