| 摘要 |
A system and method for activation of an enhanced telecommunication service without a turn-on call by a subscriber. The present invention is described in the AIN environment, where an enhanced telecommunication service is set up for a directory number. The enhanced telecommunication service has an active state wherein the enhanced telecommunication service is applied to calls received for the directory number. The enhanced telecommunication service also has an inactive state wherein the enhanced telecommunication service is not applied to calls received for the directory number. The first call is directed to the directory number, where the enhanced telecommunication service is in the inactive state. A no answer condition from the directory number is detected with respect to the first call. In response to the detection of the no answer condition, the enhanced telecommunication service changes to the active state. The enhanced telecommunication service is maintained in the active state for successive calls, whereby the enhanced telecommunication service is activated by the detection of the no answer condition for the first call, without the turn-on call from the subscriber, and remains activated for successive calls to the directory number.
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