Call Encryption

AES is standard on your system. When enabled, your system automatically encrypts calls with other systems using AES.

A locked padlock icon displays on the connected monitor(s) when a call is encrypted. If a call is unencrypted, you see an unlocked padlock. The padlock may not accurately indicate encryption status if the call is cascaded or includes an audio-only endpoint. To avoid security ambiguity, participants can verbally communicate the state of their padlock icon at the beginning of a call.

The following AES cryptographic algorithms ensure flexibility when negotiating secure media transport:

  • H.323 (per H.235.6)
    • AES-CBC-128 / DH-1024
    • AES-CBC-256 / DH-2048
  • SIP (per RFCs 3711, 4568, 6188)
    • AES_CM_128_HMAC_SHA1_32
    • AES_CM_128_HMAC_SHA1_80
    • AES_CM_256_HMAC_SHA1_32
    • AES_CM_256_HMAC_SHA1_80