The DM should send the details of collection of such data to the Chief Secretary of the State. They should inform the District Magistrate (DM), of the CDRs obtained by them every month. Under the new guidelines, only an officer of the rank of Superintendent of Police (SP) and above is authorised to seek details from telecom operators. Rules for obtaining call records were tightened following a row in 2013 over unauthorised access to CDRs of several key politicians. The CDRs need to be provided to law-enforcement agencies and the courts upon their request or direction, as per the law in force in our country at present. The record contains critically sensitive information such as Mobile Station International Subscriber Directory Numbers (MSISDNs), International Mobile Subscriber Identity (IMSI), International Mobile Equipment Identity (IMEI), and location details of mobile subscribers. The CDR is available with telecom operators.

This string of information of the CDR includes details such as the name of the subscriber, the details of calls made by this subscriber during a given period, the duration of each call, whether the call terminated normally or abnormally, location of the caller, location of the call recipient, and such other details. However, the CDR does not include contents of a telephone conversation or messages exchanged. A Call Data Record (CDR) is a set of information relating to the mobile phone calls, of a mobile user, for a particular period.

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