Phone-to-phone communication on Android
<p>I am building an app that converts text messages to speech and sends them to the destination. At the other end, the speech is converted back to text messages.</p>

<p>I imagine it may be easy with <a href="http://www.twilio.com/" rel="nofollow">Twilio</a> but I don't want to use internet connection. A simple call should be enough to transmit the data. </p>

<p>Any idea on how I should proceed with this? </p>
