| 摘要 |
<p>For each roaming mobile subscriber unit (A) call origination, the serving cellular mobile telephone system (102) transmits a roaming subscriber validation request to the roamer verification system (101), which scans the subscriber status database (317) to determine whether this roaming mobile subscriber unit (A) is a valid user. If a positive validation is not made, an inquiry is transmitted to the home switch (103) of the roaming subscriber to obtain a positive subscriber validation. The call origination is not processed until a positive subscriber validation is received from either the subscriber status database (317) or the home switch (103). This process eliminates the use of bogus subscriber numbers, such as found in tumbling subscriber units wherein a new subscriber number is used for each successive call origination to avoid detection of the bogus subscriber unit.</p> |
