| 摘要 |
<p>A selective call-waiting system for telephony use samples transmission on a busy line (33) if the line subscribes to the selective call-waiting service (59), and avoids interrupting the transmission with a call-waiting signal if the transmission is data-type (61). If the transmission on the busy line subscribing to the selective call-waiting service is voice-type, the system sends a call-waiting signal. Signal analyzers (33) are disclosed, as well as methods for practicing the invention.</p> |
