Stream Control Transmission Protocol (SCTP) is IETF alternative to TCP or UDP at the transport layer. SCTP is message-oriented (like UDP), but also connection-oriented (like TCP). SCTP tracks transmissions through message units called chunks. This allows SCTP to send parallel messages through the same channel and improves support for multihomed applications. One main purpose for SCTP is support of Voice over IP (VoIP).
See: RFC 3286.
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