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3GPP TS 27.007 version 11.8.0 Release 11 17 ETSI TS 127 007 V11.8.0 (2013-10) 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following syntactical definitions apply (refer also clause 4): Carriage return character, which value is specified with command S3. 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 ITU-T Recommendation V.250 [14] command &F0. In action type commands, this value should be used when subparameter is not given. 3.2 Abbreviations 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 ASCI Advanced Speech Call Items, including VGCS, VBS and eMLPP BCD Binary Coded Decimal eMLPP Enhanced Multi-Level Precedence and Pre-emption Service ETSI European Telecommunications Standards Institute FTM Frame Tunnelling Mode (refer 3GPP TS 27.001 [41] and 3GPP TS 29.007 [42]) HSCSD High Speed Circuit Switched Data IMEI International Mobile station Equipment Identity IRA International Reference Alphabet (ITU-T Recommendation T.50 [13]) IrDA Infrared Data Association ISO International Standards Organization ITU-T International Telecommunication Union - Telecommunications Standardization Sector ME Mobile Equipment MoU Memorandum of Understanding (GSM operator joint) MT Mobile Termination PCCA Portable Computer and Communications Association PTT Push to Talk 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 UE User Equipment UICC Universal Integrated Circuit Card USAT USIM Application Toolkit USIM Universal Subscriber Identity Module VBS Voice Broadcast Service ETSI
3GPP TS 27.007 version 11.8.0 Release 11 18 ETSI TS 127 007 V11.8.0 (2013-10) VGCS Voice Group Call Service 4 AT command syntax 4.0 General This clause summarizes general aspects on AT commands and issues related to them. TE software implementors must take account that future versions of this specification may include additional parameters beyond what is expected in any response to an AT Set Command, Read Command, Test Command, or unsolicited result code. Implementations must therefore analyse all parameters provided from the TA and discard (ignore) any parameters received following the parameters expected by the TE software. For further information refer ITU-T Recommendation V.250 [14]. In the tables for the commands syntaxes, the possible response(s) are outlined as follows: - the responses from ITU-T Recommendation V.250 [14] ( like OK and ERROR) are normally not shown; and - the final response +CME ERROR is shown when a final result code in subclause 9.2 can be provided. In certain implementations, AT commands are used as an internal interface within the physical handset, e.g. between the application and the radio interface layer 3 stack implemented on different processors. Certain AT commands transfer information in the clear that can be regarded as sensitive with regards to security or privacy. Care must be exercised in AT commands that: - transfer passwords (e.g. +CLCK, +CPWD or +CPBS); - transfer identities (e.g. IMSI) or details of a call (e.g. +COLP); - transfer the current location of the phone (e.g. +CMOLR); - reveal the IMEI (e.g. +CGSN); - allow the TE to take unintentionally control over the SIM-MT interface (e.g. +CSIM); - enable/disable access to commands protected by security mechanism (e.g. +CSCC); or - exchange security related parameters and keys with the UICC (e.g. +CEAP and +CERP). The above mentioned AT commands and parameters are examples to illustrate the concerns and is not meant to be a comprehensive list. 4.1 Command line See figure 2 for general structure of a command line. Standardized basic commands are found only in ITU-T Recommendation V.250 [14]. GSM/UMTS commands use syntax rules of extended commands. Every extended command has a test command (trailing =) to test the existence of the command and to give information about the type of its subparameters. Parameter type commands also have a read command (trailing ) to check the current values of subparameters. Action type commands do not store the values of any of their possible subparameters, and therefore do not have a read command. ETSI
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