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Grandstream GSM Gateway offers cost reductions, which is one of its main advantages. Businesses and individuals can save money on long-distance and international calls by using Grandstream Gateway. Grandstream 32 PORT FXS Gateway GXW4032 will enable any firm to build a cost-effective hybrid IP and analog telephone system that will allow them to take advantage of VoIP communications while protecting their investment in current analog phones, Fax machines, and legacy PBX systems.