| 摘要 |
<p>PCT No. PCT/EP96/04757 Sec. 371 Date Apr. 23, 1998 Sec. 102(e) Date Apr. 23, 1998 PCT Filed Oct. 31, 1996 PCT Pub. No. WO97/16914 PCT Pub. Date May 9, 1997In many communication service, such as for example virtual card calling (VCC), authentication methods are used to check the access authorization of the caller to the communication service, and thus to prevent possible misuse. A chance-controlled fee assessment is used to prevent possible misuse of the communication service.</p> |
