A RespOrg, or responsible organization, is a company that maintains the registration for individual toll-free telephone numbers in the North American Numbering Plan by means of the distributed Service Management System/800 database.
RespOrgs were established in 1993 as part of a Federal Communications Commission order instituting toll-free number portability. A RespOrg (pronounced as though it were a single word, something like "ressporg") can be a long-distance company, reseller, end user or an independent that offers an outsourced service.