We are looking for an Android app that permit type a text message, convert to waveform and send over gsm call. The call will be received by Asterisk SIP server, we need in the server side a software that can reconvert the waveform to the text was sent originally, and store the message on mysql database.
The critical feature is to play an audio during the call which has no support in android and mobile hardware manufacturers don't allow it,
The steps are:
1) text to waveform (on android app)
2) streaming audio over a call (needs Expert Kernel Programmer, modifying audio driver),
3) waveform to text (on server side)