Number Pooling

Definition:

When a company donates a thousand block(s) of numbers within a prefix (Ex: 305‐444‐B) to another company. In this

case the first company owns the prefix, but the second company is using one or more thousand blocks of TNs, and all

TNs in those thousand blocks will be owned by the second company.

A telephone company’s customer records database that contains all telephone subscriber records.

Electronic Switching System - Computerized switching of telephone calls used by the telephone company.

Data Management System - A data base managed by the telephone company which includes ANI and ALI information.

Independent Telephone Company. Pre‐divestiture term referring to any local telephone service provider that was not part of American Telephone and...

Glossary of Terms