... by local or internetl Field proven compatible with Asterisk-based soft switches Featuresl 4 SIM cards per channel ( ... conjunction with VOS, VPS, call back or other Asterisk-based soft switches, for accessing VoIP network by SIM cards ... DHCP, DNS, NAT, Telnet, HTTP, FTP, TFTPConfiguration and Management- Web-based GUI- Console, telnet command line- Centralized network managementFirmware UpdateLocal file ...