Stefano Corsi wrote:
"Eric \"ManxPower\" Wieling" wrote:
There's still something I don't understand: when using a simple modem
on an analog line, you get correct answers from the modem: "NO
ANSWER", "BUSY", "NO DIALTONE", etc... why is this possible with
these TDM2400 cards that cost twenty times as much?
I know that I'm probably missing something... could you help me
understand what?
Because the far end sends a carrier tone.
Uhm... but wait: I remember old days modem to have also a VOICE return
code... again, why should a 20$ box be able to detect VOICE while a
2000$ card shouldn't?
This stuff is not done in the card, it is done in software in Asterisk
(or Zaptel). Apparently nobody has cared enough to do the very complex
audio processing and DSP work to make this work reliably .
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