Secure user authentication
and call setup, with SHA-256 digest authentication or TLS client certificates.
Secure voice & video calls
based on ZRTP or SRTP-DTLS end-to-end encryption protocols, using AES 128-bit or 256-bit key length and safe Elliptic Curves Diffie-Hellman (ECDH) X25519 and X448.
Secure im and group chat (mobile only)
with Linphone Instant Messaging Encryption (LIME), using modern ciphering curve X448 and double ratchet algorithm for perfect forward secrecy.