My IP Pbx telephone system

Users: 100
Concurrent Calls: 22
Voicemail: 4000min

Interface:
    Up to 16 Analog Ports (FXO/FXS)
    Up to 4 GSM Ports(Quad-Band GSM/GPRS850/900/1800/1900MHz)
    Up to 8 BRI Ports
Flash: 512 MB Onboard Flash
RAM: 128 MB Onboard RAM
LAN: 1 (10/100Mbps)
WAN: 1 (10/100Mbps)

Size: 280x175x33 mm
Weight: 700g
Power Supply: AC 100~240V/50~60Hz(DC 12V, 5A)

Protocol: SIP(RFC3261), IAX2
Transport Protocol: UDP,TCP,TLS,SRTP
Codec: G.711, GSM, SPEEX, G.722, G.726, ADPCM, G.729 A, H261,
             H263,H263p, H264 ,MPEG4.
DTMF: Inband, RFC2833, SIP INFO
LED: Red for FXO/GSM, Orange for BRI, Green for FXS
Network: Static IP, PPPoE, DHCP, Firewall, VLAN, DDNS, QoS,
                DHCP Server, *VPN
Multiple Languages Support:
Chinese, English, Hebrew, Portuguese, Russian,Spanish