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.
Provide VoIP connection worldwide. Free calls to China mobile and landline, landline UK, USA, Canada, Moscow, St-Petersburg. 30 days money back guarantee.