I have question, is the digium card has polarity in analog lines. I enclountered some issue in dtmf lines some of them won’t detect in asterisk but when we test in ampenol it detected. is there any polarity in wiring connection?
thx in advance
Analogue lines, in general, have polarity. For loop start, it often doesn’t matter, as terminals tend to cope with miswired connections, but earth start would, almost certainly, require correct polarity.