Carlos E. R. wrote:
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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
is not enough.
Yes, it is possible. I have seen it done years ago. There is some
documentation of this in the
hylafax project files. There is a setup somewhere to use the modem as answerphone with
messages as files in the computer.
That was likely a "soft modem".
Some modems have jacks for audio in/out, which can be
connected to the audio card in the computer.
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.
I have set up systems with 8 conversations over a 128 Kb/s ISDN line.
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