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Provider independent Hard VoIP phones?

Ramon F Herrera
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> Isn't "FXO" the universal term?

Let's say you have an ATA which provides an FXS and an FXO port,
such as the Sipura 3000. Take a voltmeter and measure the voltage on
both ports. The FXS has some low voltage (dial tone) and the FXO
port has 0 volts.

If you happen to measure during a ring the voltage goes to some 60


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