I have SPA9000 with 2 SPA400. It purchased recently. SPA400 configure for voice and another SPA400 for existing 4 PSTN line. I connected PSTN line to the RJ11 port of SPA400. I do not see the LED green light. I cannot make outside PSTN call. Do I need to configure SPA400 to accept PSTN connection? Sorry I am totally newbie.