| 摘要 |
In a prepaid group service, a number of subscribers belonging to a group share one common prepaid group account. In order to minimize the risk of an improper call release, an undercut of the prepaid group account is determined (305) on the basis of at least one parameter; and the undercut is used when deciding (309) if a call, charged from the prepaid group account, can be set up or continued when there is at least another ongoing call which is charged from the prepaid group account. |
