DigiSAFE PhoneCrypt® is a desktop telephone encryptor that offers secure voice communication over PSTN networks. This unit supports Advanced Encryption Standard (AES) or customized algorithm to meet the high security requirement. Install between the desktop telephone and the telephone wall socket, it allows secure and unsecure (normal) operation with the touch of a button. With Diffie-Hellman public key exchange, a new random key is produced with each session call and the key is unique to the two communicating parties.