Protocols BroadNet answer

What is M3UA?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

M3UA (MTP Level 3 User Adaptation) is a SIGTRAN protocol that carries SS7 MTP3-user signaling — SCCP and ISUP — over IP using SCTP, letting legacy SS7 applications run across modern IP networks without TDM links. It is the transport most operators use to reach SS7/MAP peers today, and the layer an SS7 signaling firewall inspects. See /answers/what-is-sigtran, /answers/sigtran-adaptation-layers, and /answers/what-is-sccp.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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