| 摘要 |
A directory assistance request is received from a caller. A process attempts to determine the identity of the caller. If the caller's identity cannot be determined, a front-end sponsor advertisement is played prior to providing the directory assistance service to the caller. If the caller's identity is determined, the process identifies multiple advertisements of possible interest to the caller. Each of the multiple advertisements has an expected value. An advertisement having the highest expected value is selected and played to the caller.
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