Design the circuit board of 8 port FXS VoIP Gateway based on SIP Standard. Specific requirements: – 8 FXS ports, 1 PSTN backup line – 2 RJ-45 ports 10/100 Mbps, 1 WAN, 1 LAN (NAT/Brigde mode switchable)… (Budget: $250-$750 USD, Jobs: Electrical Engineering, Electronics, Embedded Software, PCB Layout, Product Design)
