From: Leo Ann Boon <[EMAIL PROTECTED]>
Is DTMF pass-through and caller ID fundamentally different? This card
does not seem to cause significant difficulty in DTMF detection. The high
DC voltage
As I mentioned all the DSP work is done in software. So there shouldn't be
any fundamental difference.
during ringing could be one factor. Any easy way to test serious
mismatch? The 600 Ohm is actually on-hook resistance, right? Or is this
audio impedance? The
600 Ohm is off-hook AC impedance for US and countries that follow the same
specs - consult your local regulatory docs.
card is indeed sold and used in North America.
But, where in the world are you using it?
Leo
I'm in FCC zone (North America). Maybe the DAA has a defect under high
voltage. The way I heard it, sounded like the 20Hz ringing was passed
through to ADC. Possibly the ADC isn't able to recover from saturation in
between rings.
Yuan Liu
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