Protocols BroadNet answer

What is SCTP (Stream Control Transmission Protocol)?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

SCTP (Stream Control Transmission Protocol, RFC 4960) is the transport-layer protocol that carries SIGTRAN signaling over IP. Unlike TCP it is message-oriented, multi-streamed (so one lost packet does not head-of-line-block the others), and multi-homed (an association spans multiple IP paths for instant failover) — the resilience properties a telecom control plane needs. M3UA and the other SIGTRAN adaptation layers ride on SCTP to move SS7 over IP. See /answers/sigtran-explained, /answers/what-is-m3ua, and /answers/what-is-sigtran.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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