Model HG-1000 -  E1/T1 PRI to PSTN CallBack

Model HG-2000 -  E1/T1 PRI to CDMA/TDMA or GSM

Model HG-3000 -  E1/T1 PRI to CDMA/TDMA or GSM

Model HG-4000 -  E1/T1 PRI/VoIP to CDMA/TDMA or GSM

HyperSavings white paper