Model
OpenVox IP PBX System UC501 IP PBX
VS-GW2120-4G
IPPBX with 1-8 analog interfaces
VS-GW2120-8G
Up to 800 extension register
VS-GW2120-12G/VS-GW2120-16G
Up to 300 concurrent calls with G.711 codec
VS-GW2120-20G VS-GW2120-24G
FXS-100 FXO-100 FXS-400 FXO-400
VS-GW2120-28G VS-GW2120-32G
VS-GW2120-28G VS-GW2120-32G 28 /32 GSM Channels VoIP Gateway
VS-GW2120-36G VS-GW2120-40G
VS-GW2120-36G VS-GW2120-40G 36 /40 GSM Channels VoIP Gateway
VS-GW2120-44G
UC501 is modular in design
VS-GWM400G
VS-GWM400G Frequency range: GSM 850/900/1800/1900MHz 4 GSM Port Module
Up to 44 GSM Channels
3 10/100M LAN interfaces/1 SIM card per GSM channel