Send a .wav message to a phone

[CVMichael]

I did something like this, but I only needed from phone line to sound card.

The way I did was using an electronical device wich I made to filter and amplify the sound to go into sound card (auxiliary input wich is Stereo).
That way I could record from 2 lines using only one sound card. So basically you would need a sound card per 2 lines.

This is the schematic for the device I made:
This is for one line, for 2 lines I just made 2 of them, and connected to the same jack, but one went to left channel, and the other to the right channel.


And heres a simple diagram of how it works