... line to connect Ordinary telephone set for voice call, toconnect PBX for call extentions, to connect billing systems for public phone use, to ... Gateway which has 2 RJ-11 outputs for extensions;2) It can connect with ordinary telephone set, PBX , VOIP Gateway, Billing ... if have, No. 5-7, Signal strengthFront side LEDs display for Signal strength, Power, Working Status,Talking and Battery indicator;Rear ...