[Freeswitch-users] simulating a modem transaction...

[8hector8]

Hello everybody,

Here is my issue. I need to simulate a modem transaction in C. It's a V.21
modem in 200 bits/s. This modem dial a number and waits for a "request to
send" sent by the reciever. This is where I have to simulate a modem.
The "request to send" is composed of a 2100 Hz tone for 2,4 secondes and 32
alternations of two tones :
1650 Hz and 1850 Hz, 15 ms each.
In my idea, streamFile() function seams to be the good mean.

The real issue is that when those tones are sent, the transmeter will send a
"message" which is 16 digits in V.21 mode. 8 data bits, no parity, 2 stop
bits.
200 bits/s means that each tone is 5 ms. 1180 Hz is a "1" and 980 is a "0".

So, I need to get those 16 digits messages from tones back into numbers. To
do that, I think I need a way to listen the signals and analyse them and
this is where I don't know how to do it.

Maybe, I have to create a module into freeswitch and here also I need an
help to do it.

Thanks for your attention.

8hector8
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