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. Automatic Message Accounting (AMA) records also are accumulated and uploaded to a another relational database....http://www.google.com.hk/patents/US6744866?utm_source=gb-gplus-share專利 US6744866 - Traffic track usage measurement system
