Overview of Indian Telecom Industry and Telecom Circles
Call Detail Record (CDR) is a detailed record of telephonic calls maintained by telecom exchanges. TRAI, established in 1997, regulates telecom services in India. Major mobile operators include BSNL, JIO, Vodafone + Idea, and Airtel. India is divided into 23 circles across 4 categories (Metro, A, B, C), with specific regions falling under each category.
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CDR Call Detail Record - Saiprasad Kulkarni
What is CDR? Call Detail Record (CDR) is the detailed record of all the telephonic calls that pass through a telephone exchange or any other telecommunications equipment. The record is maintained by the concerned telephone exchange and contains call details such as time of the call, duration of the call, source and destination number, completion status of the call, etc. Call detail records serve a valuable purpose of revenue generation for telephone service providers and are critical for law enforcement, whenever required. CDR is also used for VOIP and is a file containing all usage details.
TRAI Telecom Regulatory authority of India was established on 20 February 1997 by an Act of Parliament to regulate telecom services and tariffs in India. Earlier regulation of telecom services and tariffs was overseen by the Central Government. TRAI's mission is to create and nurture conditions for growth of telecommunications in India to enable the country to have a leading role in the emerging global information society.
Mobile Operators in India 15 1) BSNL 2) JIO 3) Vodafone + Idea 4) Airtel
Telecom Circles / Cellular Zones (36 States) - There are total 23 Circles divided under 4 Categories:- 1.Metro 2.A Category 3.B Category 4.C Category
Metro Category (4) 1.Delhi 2.Mumbai 3.Kolkata 4.Chennai
A - Category (6) 1.Andhra Pradesh & Telangana 2.Karnataka 3.Kerala 4.Gujarat 5.Tamil Nadu 6.Maharashtra & Goa
B - Category (7) 1.Haryana 2.Rajasthan 3.Madhya Pradesh & Chhattisgarh 4.Punjab 5.Uttar Pradesh East 6.Uttar Pradesh West & Uttarakhand 7.West Bengal & Andaman Nicobar
C - Category (6) 1.Jammu & Kashmir 2.Himachal Pradesh 3.Bihar & Jharkhand 4.Orissa 5.Assam 6.North East (Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim and Tripura) 7 Sisters of India
Call Types MOC - Mobile Originating Call MTC - Mobile Terminating Call SMO - Mobile originated messaging SMT - Mobile terminated messaging
