Thomas Kunz
Systems and Computer Engineering
41
GSM: Security
–equipment
identity checking
nEquipment Identity Register (EIR) maintains database
related to mobile equipment (hardware) identified by
International Mobile Equipment Identity (IMEI)
nIMEI consists of Type Approval Code (granted when
mobile station type passes type approval testing to ensure mobile station
behaves properly), Final Assembly Code (indicating manufacturing
plant), and the equipment serial number
nEIR stores three lists of IMEIs
–white
list contains ranges of IMEIs of type approved mobile stations,
maintained by MoU
–black
list contains IMEIs which are stolen or malfunctioning, and
are subsequently barred
–gray
list contains IMEIs which should be supervised for possible malfunctions