MIKEY
Multimedia Internet KEYing (MIKEY) is a key management protocol that is intended for use with real-time applications. It can specifically be used to set up encryption keys for multimedia sessions that are secured using SRTP, the security protocol commonly used for securing real-time communications such as VoIP.
MIKEY was first defined in RFC 3830. Additional MIKEY modes have been defined in RFC 4650, RFC 4738, RFC 6043, RFC 6267 and RFC 6509.