| 摘要 |
A Central Office voicemail system permits a customer to monitor incoming calls and decide whether or not he wishes to take the call. When a call is made to a called party (customer) and the called party does not answer the phone the call is transferred to voicemail in the usual way. Additionally, a special ringing tone is applied automatically by the Central Office to the called party line. This has the effect of alerting the called party to the fact that the caller has been transferred to voicemail. The called party can then monitor the message being left simply by lifting his phone and, if he wants to talk to the caller, he simply carries out a hookswitch flash. Alternatively, with a specially adapted terminal, the called party does not even have to lift the phone to monitor the message because the special ringing tone causes his terminal to go automatically into off-hook hands-free mode.
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