In this case study we have presented the comparison of the calls made by the clients to the telephone operator Y and the calls which have been transferred to the company responsible for the quiz through telephone calls. During this analysis we gathered calls from the Composite Call Data Record (CDR), the CDR partition is divided in two part, the CDR Originating part and the part of the CDR transit part.The part of the CDR Originating are as the showed following: Calling Party Number, Called Party Number, Date Fort Start Of Charge, Time For Start Of Charge, Time For Stop Of Charge and Chargeable Duration. The part of the CDR Transit part contains completely the same data that must be identical because it is the same call that additionally contains other information such as the name of the incoming route from which the call and outbound route or where the call came from is addressed by identifying its name. The data has been decoded by the hexadecimal system in the decade system to compare the numbers of calls, duration calls and time of calls. From the analysis that is done in this case study has come out there is a difference from the number of calls as well the duration of the calls that have been on the part of the customers to the operator Y and the calls directed by the operator Y in the contracting company X
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