Importance

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Abstract

A call directed to a mobile telephone station from a public switch telephone network is received in a mobile services switching center of a mobile telephone network. An attempt is made to locate the profile of the mobile telephone station in a visitor location register. If the mobile telephone profile is not found in the visitor location register, a query message is sent to a home location register requesting routing information for the call. The profile has an HLR query flag for indicating whether the home location register should be queried. If the profile of the mobile telephone station is found in the visitor location register, the status of the HLR query flag is checked. If the HLR query flag is set to yes, a query message is sent to a home location register requesting routing information for the call. If the HLR query flag is set to no, the call to the mobile telephone station is completed using the profile in the visitor location register. In all other cases, a query message requesting routing information has been sent to the home location register, so the call to the mobile telephone station is completed using the routing information received from the home location register.

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First Claim