CCITT-6

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CCITT-6

communications

Learn about this topic in these articles:

telephones

In telephone: Out-of-band signaling
…system was standardized internationally as CCITT-6 signaling; within North America, CCITT-6 was modified by AT&T and became known as common channel interoffice signaling, CCIS. CCIS was first installed in the Bell System in 1976.
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