| 摘要 |
PURPOSE: A collect call service method based on DID(Direct Inward Dialing) is provided to supply a collect call DID number with which a caller has a free call with a subscriber in an oversea country. CONSTITUTION: If another subscriber does not allow a caller to use a collect call, a collect call DID number of the first priority is allocated according to an area where a caller is located. The collect call DID number is one of collect call DID numbers obtained from a service provider. When another subscriber allows a caller as a subscriber, collect call DID numbers, which are not doubled and not the first priority, are allocated and notified(412). The allocated collect call DID number is notified to a caller who can use a collect call by an SMS(Short Message Service) text message(413,414). |
