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Internal Audit

Network Audit

CDR GenerationRisks

June, 2013

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Overview

CDRs Generation

CDR File Generation

Call/Event Duration

Call Time Limit

Change Management

Date & Time Sync.

B Number Table

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CDR Generation Risks

CDRs Genera&on• Different

Event

• Checking Exchangeparameters

• Test events• CDR format

Ø Required fieldsØ Unrequired fields

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CDR Generation Risks

CDR File Generation• Parameters for genera&ng

CDR les (size &me)• Exchange storage capacity• All les generated

transmi ed on &me

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CDR Generation Risks

Call/Event Duration• For Postpaid/Prepaid• Calcula&ng frac&on of

secondØ 3 s 200 ms → 3 sØ 3 s ≥ 100 ms → 4 sØ 3 s ≥ 10 ms → 4 s

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CDR Generation Risks

Call/Event Duration• Check round congura&on• For operators charge by

second• Exchange &me sensing (10

ms, 100 ms or more)

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CDR Generation Risks

Change Management• Be sure that the change not

affect CDRs genera&onspecially during Systemreplacement / upgrade

• Be sure full test done beforeapplied to all switches

• Be sure user privileges notchanged

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CDR Generation Risks

B Number Table• Wrong call rou&ng• Some country codes were

not congured in one ormore switches

• CDRs not generated forcertain call scenarios orshort codes not dened

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Thank You

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Q&

A