Abstract: A monitoring system captures and processes messages from SS7 links, to compile call detail records (CDRs) for all interoffice call attempts. The CDRs are uploaded into a relational database. A data preparation operation utilizes external information to enhance the records for further processing, for example, to translate release cause codes in the records to textual indications of reasons for the releases. The enhanced records are loaded into a multi-dimensional database. The multi-dimensional database software facilitates analysis of the records to identify a variety of network traffic patterns and related troubles. In particular, the processing of the enhanced CDR data can provide a variety of analytical tools and reports, using the release cause codes. For example, the analysis can indicate the number of calls to a destination that did not get through and identify by major categories the principle reasons that calls did not go through, e.g. user busy, no trunk available, etc.