Builds on: Telecom Basics (Part 2): Cell ID, ILD, and Call Detail Records
Reading and Checking a CDR
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A call detail record (CDR) looks simple, but each column has a trap. A time may be in the wrong zone. One call may appear as three rows. The number shown may not be the number that called. This unit reads one record line by line, then gives you a checking routine.
Focus: read every column, check before you count, and say what the record cannot show. This unit is not legal advice.
Learning objectives
- Read the main columns of a call record and say what each one means.
- Bring times to one zone before you compare them.
- Spot duplicate rows and gaps, and explain them.
- Explain what forwarding, a false caller number and a SIM box do to a record.
- Say why a call in an internet app leaves no call row.
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