# What is SCCP?

> 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.

- Canonical URL: https://www.broadnet.me/answers/what-is-sccp
- Language: en
- Last reviewed: 2026-07-22
- Publisher: BroadNet (https://www.broadnet.me)

## Related

- [All answers](https://www.broadnet.me/answers)
- [Glossary](https://www.broadnet.me/answers)
- [What is TCAP?](https://www.broadnet.me/answers/what-is-tcap)
- [What is GTT (Global Title Translation)?](https://www.broadnet.me/answers/what-is-gtt)
- [GT — Global Title in SS7 routing explained](https://www.broadnet.me/answers/ss7-global-title)
- [What is M3UA?](https://www.broadnet.me/answers/what-is-m3ua)
- [What is SS7?](https://www.broadnet.me/answers/what-is-ss7)
- [SS7 Firewall](https://www.broadnet.me/operators/ss7-firewall)
- [Signaling & CDR Intelligence](https://www.broadnet.me/platforms/signaling-cdr)