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The CGW-I is a BRI to GSM 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 GSM mobile phones. CGW-I stores the link between the dialing extension and the dialed cellular number. When a missed mobile call is returned, CGW-I recognizes the Caller ID and routes the caller to the dialer’s extension.