Patent ID: 7546113

Claim:
A method of routing Call Detail Records (CDRs) for a subscriber to a billing center associated with the subscriber, wherein the subscriber is associated with a home network and is operating in a foreign network, and the billing center is associated with the subscriber in the subscriber's home network, the method comprising the steps of: receiving in a serving Mobile Switching Center (S-MSC) in the foreign network, a registration message from a mobile terminal associated with the subscriber; sending a location updating message from the S-MSC to the subscriber's Home Location Register (HLR) in the home network of the subscriber; receiving in the S-MSC, a Mobile Application Part (MAP) data message from the HLR with subscriber profile information for the subscriber, said subscriber profile information including an Internet Protocol (IP) address of the billing center associated with the subscriber in the subscribers home network, wherein the billing center IP address is included in one of the MAP messages InsertSubscriberData, DeleteSubscriberData, and SendroutingInforesult; storing the subscriber profile information in a Visitor Location Register (VLR) in the foreign network; receiving thereafter, a call origination message from the mobile terminal; in response to the call origination message, retrieving from the VLR, the IP address of the billing center associated with the subscriber; establishing a connection between the mobile terminal and a called subscriber; generating CDRs at regular intervals while the connection is established, said generating step including placing into a header of each CDR, the IP address of the billing center associated with the subscriber; and immediately sending, through the S-MSC, each CDR via an IP network to the billing center associated with the subscriber.