AddPac AP-GS1004A is one of the models of inter-network VoIP GSM gateways, through which, it is possible to format a single network unit and to use it for VoIP-telephony, analog communication lines and GSM-network.
InfoStructure – Business VOIP providers, small business phone system, virtual phone system, hosted PBX, VoIP & Internet, and other business telecommunication services.