Description
* GSM Carriers and Base Stations Optional
* Sending SMS / USSD via built-in webpage or SMS Server
* Remote SIM
* Auto balance check and recharge (prepaid SIM)
* Call time restrictions
* Remote Control Management
* Relay Server support for NAT and encryption of IP packets
* PPTP VPN and Relay Encryption
* Built-in SIP Proxy for peer-to-peer operation
* GSM Quad Band: 850/900/1800/1901 MHz
* Call forward from GSM to VoIP and VoIP to GSM
* Call Back