| 摘要 |
<p>A method and apparatus for telephone call answer supervision, capable of detecting the completion of both national and international calls, which employ different answer confirmation formats, and provide confirmation that a placed call has been answered if least one of the following conditions occurs: 1) a tone of a given frequency, transmitted on the transmit line (18) of a telephone, is detected as received back on the receive line (22); and 2) audio activity having a non-repetitive cadence is detected on both the transmit and receive lines of the telephone.</p> |
