pdg@chinet.chi.il.us (01/10/89)
In article <telecom-v09i0006m06@vector.UUCP> shaver@atanasoff.cs.iastate.edu (Dave Shaver) writes: >Does anyone have an Area Code and NNX list? Yes, Bellcore does. They administer the master lists. There are three main `lists', The LERG, the V&H and the TPM. The LERG (Local Exchange Routing Guide) is used mainly for routing. There are quite a few (nine I think) data files on a LERG tape, each with different information. For instance, LERG 2 contains a CIC list. Lerg 8 I think has your NPA/COC list and contains info such as the switch type of the CO, the place name, etc. The V&H is used for rating. It consists of one data file which for every NPA/COC contains info such as the place name, and vertical and horizontal mileage coordinates relative to a grid superimposed on north america. These coordinates are used for calculating the distance of a call, and fitting this into a mileage band chart to get first and additional minute rates (these are published inb FCC tariff #2). This is (generally) how your phone call costs are done - although there are other methods and losts of quirks, especially in intralata rating. The placename in the V&H is the name that will end up on your phone bill. The TPM (Termination point master) is an extension of the V&H which includes such info as credit card prefixes, including corporate cards. Anybody can order a V&H or LERG (they're not cheap though), but the TPM is restricted to BOCs, LECs and independants. >[Moderator's Note: Such a list, if it exists, would be hopelessly out of >date in a short time. Not so. The LERG and V&H have update info built in for about 6 months ahead, including a field that says when the change becomes effective. There are also update services (Addison Wesley runs one) that have both mailed and on-line updates. Paul Guthrie chinet!nsacray!paul