Blue Box

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Keyword Suggestions

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Linked Keywords

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In November 1954, the Bell System Technical Journal published an article titled "In-Band Single-Frequency Signaling" which described the process used for routing telephone calls over trunk lines with the then-current signaling system, R1. [2] The article described the basics of the inter-office trunking system and the signalling used. This, while handy, could not be used in and of itself, as the frequencies used for the Multi-Frequency , or "MF", tones were not published in this article.