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On 2010-07-30 12:15, Per Jessen wrote:
Istvan Gabor wrote:
I have a conventinal external serial line data/vioce/fax modem.
Is it possible to make phone calls through the computer using this
No, it isn't possible. The next obvious choice is VoIP, but a 56K modem
is not enough.
Yes, it is possible. I have seen it done years ago. There is some documentation of this in
hylafax project files. There is a setup somewhere to use the modem as answerphone with
messages as files in the computer.
Some modems have jacks for audio in/out, which can be connected to the audio card in the
Others have "voice" capability: you speak into the microphone, the audio card
digitizes this, it is
sent over the serial port as "numbers", and the modem converts this data back to
an analog signal
(audio) that is sent electrically over the telephone wires, to be converted back to
numbers at the
exchange. Nothing magic about this.
If the line is ISDN, there is only one conversion.
That's the theory. I have never done it personally, nor do I have a voice modem
presently. I'd like
to... I would use it to make a filter for undesired phone calls via call-id.
And... for VoIP, yes, you can use a plain modem. I know because I did it, with skyp - yes,
voip, after all :-P
Cheers / Saludos,
Carlos E. R.
(from 11.2 x86_64 "Emerald" GM (Elessar))
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