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| PSTN usage records (Public switched telephone network (PSTN) usage records specify a class of call (such as internal, local, or long distance) that can be made by various users or groups of users in an organization) | |||
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| PSTN usage records (Public switched telephone network (PSTN) usage records specify a class of call (such as internal, local, or long distance) that can be made by various users or groups of users in an organization) | |||