| 单词 | customer-originated trace |
| 释义 | customer-originated trace Also known as call trace.A CLASS service of the public switched telephone network (PSTN). The feature enables the subscriber to initiate a trace on the last call received. The service is intended as a countermeasure for obscene or harassing calls. The customer initiates the trace by depressing the telephone switchhook and dialing a code.The central office (CO) records the calling number, which can be provided to law enforcement authorities on request, when the called party has filed a proper complaint. See also CLASS and PSTN. |
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