Kryptotel is an open source application to make ENCRYPTED Voice and Video calls It does use RSA 8192 bits algorithm and TLS protocol to encrypt the signals communication (caller id /called id for example), and AES 256 bit with ZRTP protocol to encrypt the audio/video communication. Kryptotel allows to make mobile voice and video calls that cannot be intercepted. Privacy Policy: https://www.vpnoneclick.com/privacy-policy/Term of Use: https://www.vpnoneclick.com/terms-of-use/Fair Usage Policy: https://securevoip.kryptotel.net/fair-usage/