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Using number portability database to solve call tromboning
Using number portability database to solve call tromboning
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机译：使用号码可移植性数据库解决电话拨入问题
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摘要
A roaming mobile station (30) travels into a new mobile switching center (MSC) (40) coverage area and performs a location update (250) with a home location register (HLR) (90) associated with the mobile station. An application module (240) within the HLR determines that the mobile station is located outside of the home Public Land Mobile Network (PLMN) (310) and updates (270) a serving number portability database (NP-DB) (140) to reflect that the mobile station has been ported to the new PLMN. All incoming calls cause a querying (160) of the NP-DB to identify the new PLMN for the mobile station. In accordance with the retrieved network address (165), the calls are accordingly routed (270) to the new PLMN directly without establishing a call connection to the home PLMN. Whenever the mobile station travels back into the home PLMN, the HLR again updates (320) the NP-DB to remove the previously stored data indicating that the mobile station has been ported.
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