Re:I work for a phone company (Score 1)

You have records and you do not know it. At least here in the states we do. On a DMS the Records are typically structure code 500 type 950 records. These records, or other similar struct 625 records are used for inter carrier billing (Recip Comp). These records have origination and destination (CPN and CDN) values for every call that enters or leaves the switch. Local calls on switch don't have records. You are correct on this. At a minimum the Tandem will have these records in a reginal hierarcy. And to trace a call takes the Fed about 2 minutes. This time is mostly dial and setup time on a modem link. What modem you ask ? The one the FCC made pay for as well as the $60,000 software update to BCS 12 on a DMS 500 so they can tap into the switch whenever they want. You just gotta love this.