| 摘要 |
A directory advertising system includes a user interface module, a database, and a control module. The user interface module displays a special telephone number for an advertiser in a directory advertisement. The database stores the directory advertisement, the special telephone number, and a maximum amount to be charged to the advertiser. The control module decrements the amount stored in the database when the special telephone number is dialed and deactivates the special telephone number when the amount reaches a predetermined level.
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