Electronic and Postal Communications (Central Equipment Identification Register) G.N. No. 417 (contd) “blacklisting” means to render a mobile telephone inactive by any mobile cellular operator, and to deliberately disable any access which any person in control of the said mobile telephone may have, to any of the network services licensees; “Call Data Records” “in its abbreviation CDR” means subscribers records with detailed call history for a specific period; “Central Equipment Identification Register” “in its abbreviation CEIR” means a shared electronic database of all Equipment Identification Registers of all network service licensees, which holds unique pairs of phone numbers and IMEIs or ESNs in form of three lists, namely white list, black list and grey list; “colour lists” means white, grey and black lists; “data” means the information to be shared between the CEIR and the network service licensees on IMEI information of stolen or lost equipment; “equipment” means mobile telephone as identified uniquely by its IMEI or ESNs; “Equipment Identification Register” “in its abbreviation EIR” means an electronic database which holds unique pairs of phone numbers and IMEIs or ESNs in form of three lists white list, black list and grey list as available within the infrustructure of the network service licensee; “Electronic Serial Number” “in its abbreviation ESN” means a unique code or number used by electronic communications network to identify an individual electronic communications equipment; “electronic communication” means radio communication or, as appropriate, the communication of information in the form of the electronic speech or other sound, data, text or images, by means of guided and unguided 26