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...y CALLING OUT and asking the other side "how do you hear me ?" j) Also please note that you need to ask your engineers what average DC voltages you should be expecting for off-hook conditions (use a DC 48Volts meter and the excellent guide available on the Wiki page), and also http://www.teracomtraining.com/tutorials/teracom-tutorial-PSTN.htm, and also the expected ring voltage when CO rings the FXO port. Please make sure you know the "names" of the points at which you are testing, so that you can be "knowledgeable" and provide that input to the engineer who will then t...

...y CALLING OUT and asking the other side "how do you hear me ?" j) Also please note that you need to ask your engineers what average DC voltages you should be expecting for off-hook conditions (use a DC 48Volts meter and the excellent guide available on the Wiki page), and also http://www.teracomtraining.com/tutorials/teracom-tutorial-PSTN.htm, and also the expected ring voltage when CO rings the FXO port. Please make sure you know the "names" of the points at which you are testing, so that you can be "knowledgeable" and provide that input to the engineer who will then t...