| 摘要 |
<p>A method of operating a telephony system for determining whether a telephone call made to a call destination terminal is a live call which is answered by a live person and not by an answering machine, the system performing steps comprising detecting that the telephone call has been answered and that the call is in progress transmitting one or more voice messages in a transmitted signal to the call destination terminal analysing a received signal from the call destination terminal to detect voice signals, and determining whether or not the telephone call is a live call by applying test criteria to relative timing of events in the received signal and transmitted signal, the test criteria being based on an expected pattern of speech and silence representative of normal conversation, wherein the call is determined to be a live call according to the test criteria if, one of the voice messages is an uninterrupted voice message during which no voice signal in the received signal is detected, and a voice signal is then detected in the received signal within a predetermined listening period, P 2 , after the uninterrupted voice message has ended.</p> |
