he GSMK CryptoPhone PSTN/1 is a secure desktop phone that connects to the public switched telephone network and comes with full source code available for independent review.

* Secures your voice's privacy
* Strongest and most secure algorithms available today
* AES256 and Twofish
* 4096 bit Diffie-Hellman key exchange with SHA256 hash function
* Readout-hash based key authentication
* 256 bit effective key length
* Encryption key is destroyed as soon as the call ends
* Source code available online for independent security assessments
* Standard analog PSTN/POTS interface with RJ11/RJ13 plug
* Audio port for interfacing the PSTN/1 with videoconferencing equipment