| 摘要 |
A cellular telephony network includes a supplementary service (SS) database in an intelligence network (IN) node. The SS database stores subscriber record which includes call barring data such as screening lists of specific numbers or countries and call barring options that indicate the treatment of the call barring data. The SS database may be located in an IN node connected to a mobile service center/visitor location register in a cellular telephony network or a signaling database point in a signaling network connected to the cellular telephony network or in the home location register of the cellular telephony network. At call origination, the MSC/VLR transmits the requested called number and MSISDN of the mobile subscriber to the SS database. The IN node compares the requested called number to the subscriber record associated with the MSISDN of the mobile subscriber and transmits a message to the MSC/VLR indicating whether the call is barred. In an alternate embodiment, a subscriber record is stored on a subscriber identity module (SIM) in a mobile station. The SIM stores a subscriber record of the mobile subscriber associated with the SIM. At call origination, the mobile station reads the subscriber record stored in the SIM and compares the requested outgoing call to the call barring options. If the subscriber record indicates that the call is barred, the mobile station displays a call barred message to the mobile subscriber.
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