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Background
R2 signalling is a channel associated signalling (CAS) system developed in the 1960s that is still in use today in Europe, Latin America, Australia, and Asia. R2 signalling exists in several country versions or variants in an international version called Consultative Committee for International Telegraph and Telephone (CCITT-R2). The R2 signalling specifications are contained in International Telecommunication Union Telecommunication Standardization Sector (ITU-T) Recommendations Q.400 through Q.490.
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