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Stream Control Transmission Protocol (SCTP)

The Stream Control Transmission Protocol (SCTP) association is an SCTP endpoint uniquely identified by transport addresses. Only one SCTP association occurs between two endpoints at a time.

The SCTP protocol is specified by RFC 4960, which updates RFC 2960 and RFC 3309.

SCTP associations are comprised of the following attributes:

  • Two SCTP terminals
  • Protocol data state
  • Active DATA chunk group

SCTP is a transport layer protocol operating through a connectionless packet network. This is an Internet Protocol (IP) for terminal communication regulation.

During transport, SCTP separates and identifies stream and DATA/control chunks as stream identifiers (SIs), stream sequence numbers (SSNs) and transmission sequence numbers (TSNs).

SCTP provides the following features:

  • Error-free data transfer
  • Sequenced and non-duplicated message delivery
  • Optional single packet bundling
  • Optional order of arrival delivery for individual messages
  • Multihoming support at association endpoints
  • Maximum transmission unit (MTU) path size for data fragmentation

SCTP always transports control chunk packets before DATA chunks, which require 32-bit boundary termination.

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