The visited network operator corrects the errors and sends the corrected TAP file back to the home network operator. A RAP file contains the rejected TAP file or records and additional data about the error, such as the error code or the error cause. RAP process is used to return rejected TAP files and records to the visited network operator for corrections. The incorrect file or records are returned to the visited network operator in a Returned Account Procedure (RAP) file. If the received TAP file contains any errors, the home network operator can reject the entire file or only the incorrect call event detail records. The home network operator validates the data in the TAP files to ensure that it conforms to the TAP standard and to the terms of the roaming agreement. The Stop Return RAP file is generated every seven days, until a TAP file is received from the visited network operator. ![]() The Stop Return RAP file is generated only if the home network operator has previously received, at a minimum, one TAP file from the visited network operator. If the visited network operator does not provide the TAP files for seven calendar days, the home network operator sends the Stop Return Returned Account Procedure (RAP) files to alert and notify the visited network operator that the TAP files have not been received for the last seven days. When the visited network operator sends a TAP file to the home network operator, after the initial TAP file is received, the home network operator expects more TAP files from the visited network operator. TAP is the process that allows a visited network operator to send call event detail records of roaming subscribers to their respective home network operators to be able to bill for the subscriber's roaming usage. The visited network operator records the activities performed by the roaming subscriber and then sends the call event details to the home network operator in the format agreed upon in the roaming agreement, usually Transferred Account Procedure (TAP) format. ![]() For example, when a mobile customer makes a call from outside his home network, roaming allows him to access the same wireless services that he has with his home network provider through a visited wireless network operator.Ī roaming agreement between the home network operator and the visited network operator defines the terms that enable each other's customers access to the wireless networks. Roaming is the ability of a wireless network operator to provide services to mobile customers from another wireless network.
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