In the North American Numbering Plan, a RespOrg (a contraction for responsible organization) is a company which maintains the registration for individual toll-free telephone numbers in the distributed Service Management System/800 database.
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While this data was originally maintained by telephone companies, the breakup of the Bell System in the 1980s and the introduction of toll-free number portability in 1993 required an independent operator maintain the SMS/800 database.
Responsible Organizations (RespOrgs) must honor the rules that distribute phone numbers fairly according to law.
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The toll-free long distance market was opened to competition after 1986 and a RespOrg system instituted in 1993 to provide toll-free number portability between rival carriers using the SMS/800 database.