Apparatus and method for enriching data records in a telecommunications network

An apparatus for enriching data records based on messages monitored on a telecommunications network having an Internet Protocol (IP) portion, the apparatus comprising:

• a data record enrichment module having an input for receiving first and second data records based on messages monitored on the IP portion of the network, the first and second data records including at least a subscriber identifier field and another information field relating to other information from the monitored messages, the data enrichment module including:
• a memory for storing a table constructed from values in the subscriber identifier field and the other information field of the received first data records, the table mapping subscriber identifiers with the other information;
• and
• a processor for checking whether a received second data record includes values in the subscriber identifier field and the other information field, wherein:
• if the received second data record includes both a subscriber identifier and the other information, the processor creates or updates a mapping between the subscriber identifier and the other information in the table and stores the received second data record, wherein each mapping of a subscriber identifier with the other information includes information as to when the mapping was created or updated and the processor deletes any mappings that are older than a predetermined value;
• and
• if the received second data record includes a subscriber identifier but does not include the other information, the processor checks the table for the other information mapped to the subscriber identifier and adds the corresponding other information, if it is present in the table, to the other information field in the received second data record and stores the received second data record.