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CCITT-6
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CCITT-6

communications
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Quick Summary

CCITT-6, also known as Common Channel Interoffice Signaling (CCIS) in North America, was an early system for out-of-band signaling in telephone networks. Developed by the International Telegraph and Telephone Consultative Committee (CCITT), it was designed to improve upon in-band signaling methods. In-band signaling used the same voice path for control signals, which could lead to interference and inefficient use of network resources. CCITT-6 established a separate data link for carrying address and other control information between telephone switches, speeding up call setup, especially for long-distance calls. While standardized internationally, it was not universally adopted, leading to the development of its successor, CCITT-7.1

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2 Britannica Sources
  1. modem
  2. telephone - Out-of-band signaling

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