3G Modem Voice functionality

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Most of the 3G modem (USB sticks) are support voice call, but all of them can do this only through the dashboard software which is shipped with them.
Do you have any information, how to get the voice from and pass the mic data to the 3G modem?
When I plug it, it installs 4 COM ports:
NEMA
Diagnostic
Application Interface
standard COM port which can be used to pass AT commands.
So currently via the standard COM port I can pass the ATDT12345678 command to call a number, the connection established, and the other end is ringing. When I answer to the call, I don't hear anything neither on the computer which the 3G modem is connected to nor on the called phone.

Any answer or workaround is appreciated.
FYI: I'm using Delphi for developing

Posted 22-May-13 22:37pm

NeoGetz0

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beratxt 30-Apr-15 1:09am

have u solved the prblem my friend ?

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Ravuri Vasu · Answer 1 · 2014-01-12T02:19:00

Hi,

I am also working on same kind of implementation and I understand that when we initiate a call through NEMA port through AT command, it will call the destination number. The other port (Application Interface/Speech port) will start sending binary data once the call is answered by other end. I am able to get that binary data but I am having the problem in finding the format of the data which means the received data should be stored in wav or some other format, I am still working on this ..

Please let me know if you already found the solution.