The services rely on the ITU-T standard Signalling System 7 (SS7) connectivity between network switches (SSPs) and databases (800 Database, LNPDB, LIDB, etc.) to operate. The CLASS standards were defined by Bellcore (now Telcordia Technologies) in the 1970s.
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Itu T - Service in America - Find Mobiles and Phone Companies
Itu T - Service in America - Find Mobiles and Phone Companies
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Itu 2024 OSIA specification recognized as ITU-T international standard VanillaPlus
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