| 摘要 |
<p>The invention provides a system for monitoring of telephone calls on a plurality of inbound and outbound voice channels made to and originating from a common private branch exchange (PBX) to detect fraudulent activity. Means are provided for monitoring and detecting audio data on two or more of said voice channels. The detecting means comprises analysis of binary data streams on at least one inbound voice channel and at least one outbound voice channel and comparing said streams by a sliding window means to slide a sample frame of one channel binary data stream backwards and/or forwards relative to the other binary data stream to synchronise the inbound voice channel and outbound voice channel. The comparison determines if a data match is present between the compared inbound channel and the outbound channel; and adapted for blocking the at least one outbound voice channel, if a data match is found with at least one inbound voice channel.</p> |
