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Signalling System No. 7

A CCS (Common Channel Signalling) system defined by the ITU-T (International Telecommunications Union-Telecommunication Standardization Sector). SS7 is used in many modern telecoms networks and provides a suite of protocols which enables circuit and non circuit related information to be routed about and between networks. The main protocols include MTP (Message Transfer Part), SCCP (Signalling Connection Control Part) and ISUP (ISDN User Part).

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