KF8-8-4G GSM GateWay is a 8-channel GSM VoIP Gateway used to smoothly transmit between mobile and VoIP networks for transmission of voice and SMS. 1 Channel Support 1 port SIM Cards switching, which allow a great performace for cost saving Integrated GSM connectivity and SIP protocol compatible with mainstream VoIP platforms, it is suitable for enterprises, multi-site organizations, call terminators and areas with limited landline like rural area to cut down telephony costs and enable easy & efficient communications.