Client/Server GSM voice encryption

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
We are looking for an Android client that permit type a text message, encript it and send over gsm call. The call will be received by Asterisk SIP server, we need in the server side a software that can decript the audio encripted before in the Android client and extract the text was sent originally.

Skills required:
Android, Mobile Phone
About the employer:
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