, () . MML , , .
HLR :
, GSM
( ) , GSM,
, :
(ODB) (, ) (. 3.6.5)
ODB (. 3.6.5)
, , GSM, , . GSM .
(SIM)
, GSM (SIM) IMSI Ki, 3 8.
3 . PLMN . D900/D1800 :
SIM , . HLR
HLR PLMN . HLR
. 3, 8 IMSI.
(. " SSS", 1, " ", " SIM-").
USSD
, (USSD), GSM, PLMN (. " D900/D1800", " ", " GSM"). , , GSM , .. , (CCBS), , .. USSD PLMN. , (" USSD"), , , , .
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USSD SSS ( ). MSC USSD , , , MSC HLR.
, USSD ( ) . MSC , .. . USSD .