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We found 2 dictionaries that define the word Signalling System No. 7:

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  1. Signalling System No. 7, Signalling System No. 7: Wikipedia, the Free Encyclopedia

Definitions from Wikipedia (Signalling System No. 7)

noun:  Signaling System No. 7 is a set of telephony signaling protocols developed in the 1970s that is used to setup and teardown telephone calls on most parts of the global public switched telephone network.


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