Specifications: Up to 32 GSM/3g channels (hot swappable) 3g network support Up to 8 SIM cards per channel Up to 2 isdn pri interfaces VOIP interface Efficient least cost routing (lcr) according to free minutes, prefixes of operators, call time, etc. Dynamic clip routing Large memory (245 thousand) for detailed call data records Correct tone detection SMS and voice callback Support of SMS sending and receiving Antenna splitter - 2 high gain yagi antennas for the whole system Comfortable remote control and management Support of external number portability database (npdb) Compact design Worldwide use (all frequencies are supported) GSM network monitoring/SMS at no answer