Home | Products | Patton Electronics | VoIP | Analog VoIP Routers | SmartLink 4020 SoHo Series SmartLink 4020 SoHo Series Additional Documentation SL4020 datasheet (1.25 MiB) SmartLInk Analog VoIP SoHo Router SL4022/EUI SmartLink 2 FXS VoIP GW-Router, 2x 10/100bTX, External UI Power. Request Pricing