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.
After many years in the VoIP industry supplying long distance service and VoIP technical support, AirStar Communications has decided to expand into the residential and business phone service.