Domestic to international collect call blocking
View Patent ↗A method and device for preventing fraud in collect calls from a domestic origin point to an international terminating point through a long-distance telecommunications system is described. In the system and method, a Screening for International Calls database is added to the call processing platform. This Screening of International Calls database contains records keyed by country codes, and each record has a blocked collect call field listing destination numbers that are blocked from receiving collect calls. When a domestic-to-international collect call is made, the record corresponding to the country code of the international terminating point of the collect call is retrieved from the Screening for International Calls database. This record is checked to determine if the destination number of the collect call matches any destination numbers listed in the blocked collect call field of the country code database record. If there is a match, the call is blocked.
1. A method for preventing telephony fraud, the method comprising:
maintaining a centralized database resident within a domestic region, the database being configured to store a block call list that includes a terminating number corresponding to an international region, wherein the database is accessible by all telephony switches within a first telephony network; and
receiving a database query initiated by one of the telephony switches in response to a collect call placed to a destination number terminated via a second telephony network within the international region, wherein the collect call is blocked if the database query results in a response indicating the destination number is within the block call list.
2. A method according to claim 1 , wherein the first telephony network is maintained by a domestic service provider, and the second telephony network is maintained by an international service provider.
3. A method according to claim 2 , wherein the block call list is updated based on call records of the second telephony network.
4. A method according to claim 2 , wherein the second telephony network includes a cellular network, and the destination number corresponds to a cellular phone.
5. A method according to claim 1 , wherein the terminating number in the block call list includes a wildcard character.
6. A method according to claim 1 , the method further comprising:
determining whether the block call list has any entries; and
comparing the destination number with entries within the block call list if the list has at least one entry.
7. A method according to claim 1 , wherein the block call list includes entries that exhibit a fraud-to-revenue ratio exceeding a predetermined threshold or that correspond to accounts that have overdue balances.
8. A method according to claim 1 , wherein a record within the database includes the block call list, a field specifying a country code of the international region, and a field specifying a category of billing product, the category including collect calls.
9. A system for preventing telephony fraud, the system comprising:
a centralized database resident within a domestic region, the database being configured to store a block call list that includes a terminating number corresponding to an international region, wherein the database is accessible by all telephony switches within a first telephony network,
wherein a database query is initiated by one of the telephony switches in response to a collect call placed to a destination number terminated via a second telephony network within the international region, wherein the collect call is blocked if the database query indicates the destination number is within the block call list.
10. A system according to claim 9 , wherein the first telephony network is maintained by a domestic service provider, and the second telephony network is maintained by an international service provider.
11. A system according to claim 10 , wherein the block call list is updated based on call records of the second telephony network.
12. A system according to claim 10 , wherein the second telephony network includes a cellular network, and the destination number corresponds to a cellular phone.
13. A system according to claim 9 , wherein the terminating number in the block call list includes a wildcard character.
14. A system according to claim 9 , wherein a determination is made whether the block call list has any entries before comparing the destination number with entries within the block call list.
15. A system according to claim 9 , wherein the block call list includes entries that exhibit a fraud-to-revenue ratio exceeding a predetermined threshold or that correspond to accounts that have overdue balances.
16. A system according to claim 9 , wherein a record within the database includes the block call list, a field specifying a country code of the international region, and a field specifying a category of billing product, the category including collect calls.
17. A system for preventing telephony fraud, the system comprising:
a bridging switch configured to access a centralized database, the centralized database being resident within a domestic region and being configured to store a block call list that includes a terminating number corresponding to an international region; and
an interexchange switch in communication with the bridging switch and configured to process a collect call placed to a destination number corresponding to a device served by a first service provider, wherein the interexchange switch and the bridging switch are operated by a second service provider, the collect call initiating a database query to the database, wherein the collect call is blocked if the database query results in a response indicating the destination number is within the block call list.
18. A system according to claim 17 , wherein the first service provider is an international service provider, and the second service provider is a domestic service provider.
19. A system according to claim 18 , wherein the block call list is updated based on call records of the first service provider.
20. A system according to claim 18 , wherein the device is a cellular phone.