HD voice modem for end to end secure call

This paper proposes a realistic, easy implementable, low computation and deployable modem which allows ubiquitous end to end encrypted voice communication over both local and cross-border HD Voice systems. A step by step methodology on how to use HD Voice channel to transmit data is presented. The solution was developed and tested using Matlab and open source libraries. In order to prove its applicability and efficiency a quality analysis over different communication networks is presented.