R2 signaling is a CAS system developed in the 1960s that is still in use today in Europe, Latin America, Australia, and Asia. Originally known as multi-frequency code (MFC) signaling, R2 signaling exists in several country versions or variants and in an international version called CCITT-R2.

R2 signaling operates over two- or four-wire analog and digital trunks and does not operate over TASI-equipped trunks or satellite links. R2 signaling is more suitable for relatively short international trunks. One of the differentiating aspects of this system compared to R1 is its register or inter-register signaling.

This section focuses on supervision and inter-register signaling for CCITT-R2 and National R2 signaling systems.

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