| 摘要 |
A facility observation and supervisory system to be used by a facility f or monitoring, reporting, and notification of certain telephone calls, which comprises: a PBX having a plurality of telephone sets operatively connected thereto; and a computer platform interconnected with, and operating as an interface to, the PBX system, wherein the computer platform includes pre-programmed software to record, on demand, calls passing through the PBX system, and trace calls, wherein enablement of the call tracing is completed in an undetected manner.
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