KBtechnologies/Cryptofon

The Cryptofon Project aims to design a universal narrowband voice and text / data narrowband communication standard, that is encrypted and flexible to adapt for existing narrowband communication systems - aimed to be a more secure and open alternative to the propietary Secure Communications Interoperability Protocol (SCIP)

Cryptofon

A fully encrypted transparent telephony Solution.

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You may find the specification draft here.