Protocols BroadNet answer

What is SCCP?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

SCCP (Signalling Connection Control Part) is the SS7 network-layer protocol that adds global-title routing and subsystem addressing on top of MTP, so signaling can reach nodes — HLRs, MSCs, SMSCs — by global title rather than a fixed point code. TCAP and MAP ride on SCCP, and SCCP-level Global Title translation is where operators and firewalls steer and screen inter-network SMS signaling. See /answers/what-is-tcap, /answers/ss7-global-title, and /answers/what-is-m3ua.

Plain-language definitionVendor-neutralReviewed July 22, 2026

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