Signalling Connection Control Part (SCCP) is a portion of International Telecommunication Union (ITU) recommendation Q.711, which is the routing protocol for Signalling System 7 (SS7), a set of protocols used to set up calls in telephony networks. In some parts of Europe, SS7 is called C7.
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Signalling Connection Control Part provides reliable delivery of packets between end stations in a telephony network. SCCP makes it possible to address a message to a specific type of device, such as a conventional telephone set, cell phone set, VoIP end station, fax machine, or computer. SCCP maintains the correct sequencing of packets, even during times of high network traffic or partial network failure. SCCP is used as the transport layer for services such as 800/888/877 (free-phone) numbers, phone cards (calling cards), and roaming in cellular networks.