Signalling Connection Control Part

SS7 protocol suite
SS7 protocols by OSI layer
ApplicationINAP, MAP, IS-41...
TCAP, CAP, ISUP, ...
NetworkMTP Level 3 + SCCP
Data linkMTP Level 2
PhysicalMTP Level 1

The Signalling Connection Control Part (SCCP) is a network layer[1] protocol that provides extended routing, flow control, segmentation, connection-orientation, and error correction facilities in Signaling System 7 telecommunications networks. SCCP relies on the services of MTP for basic routing and error detection.