| 摘要 |
After playing a message, a message delivery system (1) prompts a message recipient (3) with an option to automatically call back the calling party (2). If the recipient (2) activates the callback feature, the message delivery system (3) retrieves the calling party's telephone number and directs the telecommunications switch to connect the return telephone call from the called unit (3) to the calling unit (2). If the return telephone call is answered by the calling unit (2), the message delivery system (1) may optionally direct the billing system to charge the telephone number corresponding to the calling unit (2) for the return telephone call initiated by the recipient (3). Additionally, the message delivery system (1) may optionally include a feature whereby the calling party expressly provides the system with a telephone number to which a call is to be returned.
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