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Cryptophone PSTN/1
The 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