Hi Howard Wittenberg , thanks again!.If could be when it detect PSTN line port with negative voltage, but ifis positive values it works without any problem, even if LINE-In usethreshold is 30 volts.By the way I had indicated it in my answer when I ha...

Hi Howard Wittenberg, thanks again!My conclusion, this issue it become due to LINE-In voltage thresholdvalue and way software handler define, more when it related to negativeline voltage values (I can't understand why this device it detectpolarity fo...

Hi Howard Wittenberg (Participant)Thanks for the information, yes you are right! I have tested by settinglowering voltage and it start to work.By the way this add confusion, because line-in use threshold value itseems automatically get when detect te...

First of all I do not understand where try to go your comments and what could contribute, I just refereed to response Dan Lukes to POTS polarity changes in the terminals "most modern digital phones can do automatic polarity switching ..." (by the way...

Thanks By the way when I referred about PJSIP issue was based on 503 message were becomes from gateway, since from the beginning there were no external factors (network, power, PSTN connections) that indicate to be a possible cause, keep in mind that...