ALeen Cellular Gateway CGW-I: ISDN-BRI Gateway The CGW-I is a BRI Cellular Gateway that lets you call cellular numbers from your ISDN telephone system, benefiting from low business tariffs, bypassing your landline carrier and eliminating interconnection fees. The CGW-I is your transparent and low cost solution for calls to mobile phones: Fast ROI (Return On Investment) Available with 2 GSM/CDMA channels Supports worldwide GSM frequencies (900/1800, 850/1900MHz), CDMA One and CDMA 2000 (800/1900MHz)