Thank you, I have identified the issue. It has to do with the RJ10 connector that powers up the AT40 Analog phone. I replaced the RJ10 connector with an RJ11 connector.
@CoralTech
I already tried same model telephone and it is brand new but same thing happened its not ringing. maybe I can check the cabling or the port that local extension. TY!
FYI the system is SL1000.
Has someone here found a solution for the NEC analog telephone not ringing problem?
I cheked already the programming and analog telephone is set to default to be ringing unlike digital telephone you have a choice signal or voice.
Thank you in advance.
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