Common Language Location Identification

<p>Common Language Location Identification (CLLI) is an application of <a href="/facts/Common_Language_Information_Services/BMcLvFYh">Common Language Information Services</a> in the North American <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a> industry. It specifies the location and function of telecommunication equipment or of a relevant location such as an international border or a supporting equipment location, such as a manhole or pole.  CLLI was developed in the 1960s in the <a href="/facts/Bell_System/GspEoeEF">Bell System</a>, and continued use after divestiture in the North American market under managment by Bellcore, later renamed to Telcordia and <a href="/facts/Iconectiv/MBQAkk4J">Iconectiv</a>, which claims trademarks on the names "Common Language" and "CLLI".
</p><p>CLLI codes are useful to telecommunications companies for ordering telephone service, for the rating of call detail records for billing purposes, and to assist in tracing calls.  CLLI codes are associated with Vertical and Horizontal coordinates (frequently abbreviated to "V and H coordinates"), which were developed by <a href="/facts/AT%26T_Corporation/BfsX7eX2">AT&T</a> researcher Jay K. Donald to provide a relatively simple method of calculating distance between two network locations.  Various mileage-sensitive services are priced according to the V and H coordinates associated with the two endpoints' CLLI codes.
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Common Language Location Identification