07.073GPPAT Command set for GSM Mobile Equipment (ME)Release 1998TS
For the purposes of the present document, the following abbreviations apply:
AT ATtention; this two‑character abbreviation is always used to start a command line to be sent from TE to TA
BCD Binary Coded Decimal
ETSI European Telecommunications Standards Institute
HSCSD High Speed Circuit Switched Data
IMEI International Mobile station Equipment Identity
IRA International Reference Alphabet (ITU‑T T.50 )
IrDA Infrared Data Association
ISO International Standards Organisation
ITU‑T International Telecommunication Union ‑ Telecommunications Standardization Sector
ME Mobile Equipment, e.g. a GSM phone (equal to MS; Mobile Station)
MoU Memorandum of Understanding (GSM operator joint)
PCCA Portable Computer and Communications Association
RDI Restricted Digital Information
RLP Radio Link Protocol
SIM Subscriber Identity Module
TA Terminal Adaptor, e.g. a GSM data card (equal to DCE; Data Circuit terminating Equipment)
TE Terminal Equipment, e.g. a computer (equal to DTE; Data Terminal Equipment)
TIA Telecommunications Industry Association
UDI Unrestricted Digital Information
For the purposes of the present document, the following syntactical definitions apply (refer also clause 4):
<CR> Carriage return character, which value is specified with command S3.
<LF> Linefeed character, which value is specified with command S4.
<…> Name enclosed in angle brackets is a syntactical element. Brackets themselves do not appear in the command line.
[…] Optional subparameter of a command or an optional part of TA information response is enclosed in square brackets. Brackets themselves do not appear in the command line. When subparameter is not given in parameter type commands, new value equals to its previous value. In action type commands, action should be done on the basis of the recommended default setting of the subparameter.
underline Underlined defined subparameter value is the recommended default setting of this subparameter. In parameter type commands, this value should be used in factory settings which are configured by V.25ter  command &F0. In action type commands, this value should be used when subparameter is not given.