ETSI ETS 300 642 ed.4 (1999-03)

Digital cellular telecommunications system (Phase 2) (GSM); AT command set for GSM Mobile Equipment (ME) (GSM 07.07 version 4.4.1)

RE/SMG-040707PR3

Digitalni celični telekomunikacijski sistem (faza 2) – Nabor ukazov AT za GSM mobilno opremo (ME) (GSM 07.07, različica 4.4.1)

General Information

• Status: Published
• Publication Date: 22-Mar-1999
• Technical Committee: SMG 4 - Data Services
• Current Stage: 12 - Completion
• Due Date: 26-Mar-1999
• Completion Date: 23-Mar-1999
• Ref Project: SIST ETS 300 642 E4:2003 - Digital cellular telecommunications system (Phase 2) (GSM); AT command set for GSM Mobile Equipment (ME) (GSM 07.07 version 4.4.1)

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±1DERUXND]RY$7]D*60
PRELOQRRSUHPR0(*60UD]OLþLFD
Digital cellular telecommunications system (Phase 2) (GSM); AT command set for GSM
Mobile Equipment (ME) (GSM 07.07 version 4.4.1)
Ta slovenski standard je istoveten z: ETS 300 642 Edition 4
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 642
TELECOMMUNICATION March 1999
STANDARD Fourth Edition
Source: SMG Reference: RE/SMG-040707PR3
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2);
AT command set for GSM Mobile Equipment (ME)
(GSM 07.07 version 4.4.1)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: [e-mail] - http://www.etsi.org
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1999. All rights reserved.

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ETS 300 642 (GSM 07.07 version 4.4.1): March 1999
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Standards Making Support Dept." at the address shown on the title page.

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ETS 300 642 (GSM 07.07 version 4.4.1): March 1999
Contents
Intellectual Property Rights.6
Foreword .6
1 Scope .8
2 References.8
3 Abbreviations and definitions .10
3.1 Abbreviations .10
3.2 Definitions .10
4 AT command syntax .11
4.1 Command line.11
4.2 Information responses and result codes.11
4.3 ITU-T V.25ter [14] TE-TA interface commands.12
5 General commands.12
5.1 Request manufacturer identification +CGMI.12
5.2 Request model identification +CGMM .13
5.3 Request revision identification +CGMR .13
5.4 Request product serial number identification +CGSN .14
5.5 Select TE character set +CSCS .14
5.6 ITU-T V.25ter [14] generic TA control commands.15
5.7 PCCA STD-101 [17] select wireless network +WS46 .15
5.8 Informative examples.16
6 Call control commands and methods.18
6.1 Select type of address +CSTA.18
6.2 ITU-T V.25ter [14] dial command D.18
6.3 Direct dialing from phonebooks .19
6.4 Call mode +CMOD.20
6.5 Hangup call +CHUP.20
6.6 Alternating mode call control method .21
6.7 Select bearer service type +CBST.23
6.8 Radio link protocol +CRLP.24
6.9 Service reporting control +CR.24
6.10 Extended error report +CEER.25
6.11 Cellular result codes +CRC .26
6.12 ITU-T V.25ter [14] call control commands.27
6.13 ITU-T V.25ter [14] data compression commands.27
6.14 Informative examples.27
7 Network service related commands.29
7.1 Subscriber number +CNUM.29
7.2 Network registration +CREG .30
7.3 Operator selection +COPS .30
7.4 Facility lock +CLCK.32
7.5 Change password +CPWD.33
7.6 Calling line identification presentation +CLIP.33
7.7 Calling line identification restriction +CLIR.34
7.8 Connected line identification presentation +COLP .35
7.9 Closed user group +CCUG.36
7.10 Call forwarding number and conditions +CCFC .37
7.11 Call waiting +CCWA .38
7.12 Call hold and multiparty +CHLD.39

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7.13 Call transfer +CTFR . 39
7.14 Unsupported GSM supplementary services. 40
7.15 Informative examples.40
8 Mobile Equipment control and status commands. 42
8.1 Phone activity status +CPAS. 43
8.2 Set phone functionality +CFUN. 43
8.3 Enter PIN +CPIN . 44
8.4 Battery charge +CBC . 45
8.5 Signal quality +CSQ .45
8.6 Mobile Equipment control mode +CMEC. 46
8.7 Keypad control +CKPD . 47
8.8 Display control +CDIS . 48
8.9 Indicator control +CIND. 49
8.10 Mobile Equipment event reporting +CMER. 50
8.11 Select phonebook memory storage +CPBS. 51
8.12 Read phonebook entries +CPBR. 52
8.13 Find phonebook entries +CPBF. 53
8.14 Write phonebook entry +CPBW. 54
8.15 Clock +CCLK. 55
8.16 Alarm +CALA . 55
8.17 Generic SIM access +CSIM. 56
8.18 Informative examples.57
9 Mobile Equipment errors. 61
9.1 Report Mobile Equipment error +CMEE. 61
9.2 Mobile Equipment error result code +CME ERROR . 61
9.3 Informative examples. 62
Annex A (normative): Summary of commands from other standards . 63
Annex B (normative): Summary of result codes. 65
Annex C (informative): Commands from TIA IS-101. 66
C.1 Select mode +FCLASS. 67
C.2 Buffer threshold setting +VBT. 67
C.3 Calling number ID presentation +VCID . 68
C.4 Receive gain selection +VGR. 68
C.5 Transmit gain selection +VGT . 68
C.6 Initialise voice parameters +VIP . 69
C.7 Inactivity timer +VIT . 69
C.8 Line selection +VLS. 69
C.9 Receive data state +VRX . 71
C.10 Select compression method +VSM . 71
C.11 DTMF and tone generation +VTS. 71
C.12 Tone duration +VTD . 72
C.13 Transmit data state +VTX. 72
Annex D (informative): Bibliography . 73

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Annex E (informative): Mobile originated alternating voice/data call example.74
Annex F (informative): Mobile terminated voice followed by data call example.75
Annex G (informative): Voice call example.76
Annex H (informative): Change Request History .77
History.78

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Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The
information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-
members, and can be found in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially
Essential, IPRs notified to ETSI in respect of ETSI standards", which is available free of charge from the
ETSI Secretariat. Latest updates are available on the ETSI Web server (http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
No guarantee can be given as to the existence of other IPRs not referenced in SR 000 314 (or the
updates on the ETSI Web server) which are, or may be, or may become, essential to the present
document.
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS specifies a profile of AT commands and recommends that this profile be used for controlling
Mobile Equipment (ME) functions and GSM network services from a Terminal Equipment (TE) through
Terminal Adaptor (TA) for the Digital cellular telecommunications system.
The contents of this ETS is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of this ETS, it will be resubmitted for OAP by ETSI with an
identifying change of release date and an increase in version number as follows:
Version 4.x.y
where:
4 indicates GSM Phase 2;
x the second digit is incremented for all changes of substance, i.e. technical enhancements,
corrections, updates, etc.
y the third digit is incremented when editorial only changes have been incorporated in the
specification.
Transposition dates
Date of adoption of this ETS: 26 March 1999
Date of latest announcement of this ETS (doa): 30 June 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1999
Date of withdrawal of any conflicting National Standard (dow): 31 December 1999

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1 Scope
This European Telecommunications Standard (ETS) specifies a profile of AT commands and
recommends that this profile be used for controlling Mobile Equipment (ME) functions and GSM network
services from a Terminal Equipment (TE) through Terminal Adaptor (TA). The command prefix +C is
reserved for Digital Cellular in ITU-T Recommendation V.25ter [14]. This ETS has also the syntax details
used to construct these extended GSM commands. Commands from ITU-T Recommendation V.25ter
[14] and existing digital cellular standards (TIA IS-99 [15] and TIA IS-135 [16]) are used whenever
applicable. Some of the new commands are defined in such way that they can be easily applied to ME of
networks other than GSM. ITU-T T.31 [11] and ITU-T T.32 [12] fax AT commands may be used for GSM
fax transmission from TE.
This ETS assumes an abstract architecture comprising of a TE (e.g. a computer) and a ME interfaced by
a TA (see figure 1). The span of control of the defined commands should allow to handle any physical
implementation that this abstract architecture may lead to:
- TA, ME and TE as three separate entities;
- TA integrated under the ME cover, and the TE implemented as a separate entity;
- TA integrated under the TE cover, and the ME implemented as a separate entity;
- TA and ME integrated under the TE cover as a single entity.
The commands described in this ETS may be observed on the link between the TE and the TA. However,
most of the commands retrieve information about the ME, not about the TA.
responses ME status
TE TA ME
AT cmds ME control
network messages
USER & APPLICATIONS NETWORK
Figure 1: Setup
Interface between TE and TA is intended to operate over existing serial (ITU-T Recommendation V.24)
cables, infrared link, and all link types with similar behaviour. For correct operation many of the defined
commands require eight bit data and therefore it is recommended that TE-TA link is set to eight bits/ byte
mode. (For infrared operation implementation refer informative references IrDA and TIA-617.) Interface
between TA and ME is dependent on the interface in the ME.
2 References
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] GSM 02.02 (ETS 300 501): "Digital cellular telecommunication system
(Phase 2); Bearer Services (BS) supported by a GSM Public Land Mobile
Network (PLMN)".
[2] GSM 02.03 (ETS 300 502): "Digital cellular telecommunication system
(Phase 2); Teleservices supported by a GSM Public Land Mobile Network
(PLMN)".
[3] GSM 02.81 (ETS 300 514): "Digital cellular telecommunication system
(Phase 2); Line identification supplementary services - Stage 1".

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ETS 300 642 (GSM 07.07 version 4.4.1): March 1999
[4] GSM 02.82 (ETS 300 515): "Digital cellular telecommunication system
(Phase 2); Call Forwarding (CF) supplementary services - Stage 1".
[5] GSM 02.83 (ETS 300 516): "Digital cellular telecommunication system
(Phase 2); Call Waiting (CW) and Call Hold (HOLD) supplementary services -
Stage 1".
[6] GSM 02.88 (ETS 300 520): "Digital cellular telecommunication system
(Phase 2); Call Barring (CB) supplementary services - Stage 1".
[7] GSM 03.03 (ETS 300 523): "Digital cellular telecommunication system
(Phase 2); Numbering, addressing and identification".
[8] GSM 04.08 (ETS 300 557): "Digital cellular telecommunication system
(Phase 2); Mobile radio interface layer 3 specification".
[9] GSM MoU SE.13, GSM MoU Association Permanent Reference Document
SE.13 (October 1994): "GSM Mobile Network Codes and Names".
[10] ITU-T Recommendation E.212: "Identification plan for land mobile stations".
[11] ITU-T Recommendation T.31: "Asynchronous facsimile DCE control, service
class 1".
[12] ITU-T Recommendation T.32: "Asynchronous facsimile DCE control, service
class 2".
[13] ITU-T Recommendation T.50: "International Reference Alphabet (IRA)
(Formerly International Alphabet No. 5 or IA5) - Information technology - 7-bit
coded character set for information exchange".
[14] ITU-T Draft new Recommendation V.25ter: "Serial asynchronous automatic
dialling and control".
[15] Telecommunications Industry Association TIA IS-99: "Data Services Option
Standard for Wideband Spread Spectrum Digital Cellular System”.
[16] Telecommunications Industry Association TIA IS-135: "800 MHz Cellular
Systems, TDMA Services, Async Data and Fax".
[17] Portable Computer and Communications Association PCCA STD-101 Data
Transmission Systems and Equipment: “Serial Asynchronous Automatic Dialing
and Control for Character Mode DCE on Wireless Data Services”
[18] GSM 04.22 (ETS 300 563): "Digital cellular telecommunication system
(Phase 2); Radio Link Protocol (RLP) for data and telematic services on the
Mobile Station - Base Station System (MS - BSS) interface and the Base Station
System - Mobile-services Switching Centre (BSS - MSC) interface".
[19] GSM 02.30 (ETS 300 511): "Digital cellular telecommunication system
(Phase 2); Man Machine Interface (MMI) of the Mobile Station (MS)”.
[20] GSM 05.08 (ETS 300 578): "Digital cellular telecommunication system
(Phase 2); Radio subsystem link control”.
[21] GSM 02.85 (ETS 300 518): "Digital cellular telecommunication system
(Phase 2); Closed User Group (CUG) supplementary services - Stage 1”.
[22] GSM 02.84 (ETS 300 517): “Digital cellular telecommunication system
(Phase 2); MultiParty (MPTY) supplementary services - Stage 1”.

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ETS 300 642 (GSM 07.07 version 4.4.1): March 1999
3 Abbreviations and definitions
3.1 Abbreviations
For the purposes of this ETS 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
IMEI International Mobile station Equipment Identity
IRA International Reference Alphabet (ITU-T T.50 [13])
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
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
3.2 Definitions
For the purposes of this ETS 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 V.25ter [14] command &F0. In action
type commands, this value should be used when subparameter is not given.

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4 AT command syntax
This clause summarizes general aspects on AT commands and issues related to them. For further
information refer ITU-T Recommendation V.25ter [14].
4.1 Command line
See figure 2 for general structure of a command line. Standardized basic commands are found only in
V.25ter [14]. GSM 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.
read command for checking
current subparameter values
subparameter
command line
extended commands are
command line prefix
termination character
delimited with semicolon
ATCMD1 CMD2=12; +CMD1; +CMD2=,,15; +CMD2?; +CMD2=?
subparameters
basic command
may be omitted
(no + prefix)
extended command
test command for checking
(prefixed with +)
possible subparameter values
Figure 2: Basic structure of a command line
If verbose responses are enabled with command V1 and all commands in a command line has been
performed successfully, result code OK is sent from the TA to the TE. If numeric
responses are enabled with command V0, result code 0 is sent instead.
If verbose responses are enabled with command V1 and subparameter values of a command are not
accepted by the TA (or command itself is invalid, or command cannot be performed for some reason),
result code ERROR is sent to the TE and no subsequent commands in the command
line are processed. If numeric responses are enabled with command V0, result code 4 is sent
instead. ERROR (or 4) response may be replaced by +CME ERROR: (refer clause 9) when
command was not processed due to an error related to ME operation.
4.2 Information responses and result codes
The TA response for the example command line of figure 2 could be as shown in figure 3. Here, verbose
response format is enabled with command V1. If numeric format V0 would have been used,
headers of information responses would have been left out and final result code changed to 0.
also string type subparameters possible
information response to +CMD2=?
information response to +CMD2?
+CMD2: 3,0,15,"GSM"
+CMD2: (0-3),(0,1),(0-12,15),("GSM","IRA")
OK
shows acceptable ranges of each subparameter
final result code
Figure 3: Response to a command line

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So called intermediate result codes inform about progress of TA operation (e.g. connection establishment
CONNECT), and so called unsolicited result codes indicate occurrence of an event not directly associated
with issuance of a command from TE (e.g. ring indication RING).
4.3 ITU-T V.25ter [14] TE-TA interface commands
Table 1 summarizes V.25ter [14] commands relating to command line and response formatting, and TA-
TE interface operation. All are applicable to GSM terminals.
Table 1: V.25ter commands relating to TE-TA interface
Command Section Impl. Use in GSM
S3=[]
6.2.1 mand. command line termination character (mandatory default setting IRA
13)
S4=[]
6.2.2 mand. response formatting character (recommended default IRA 10)
S5=[]
6.2.3 mand. command line editing character (recommended default IRA 8)
E[]
6.2.4 mand. command echo (recommended default 1 i.e. TA echoes commands
back)
Q[]
6.2.5 mand. result code suppression (recommended default 0 i.e. TA transmits
result codes)
V[]
6.2.6 mand. TA response format (recommended default 1 i.e. verbose format)
X[]
6.2.7 mand. defines CONNECT result code format; values manufacturer specific
&C[]
6.2.8 mand. determines how ITU-T V.24 circuit 109 (or equivalent) relates to the
detection of received line signal from remote end (recommended
default 1 i.e. 109 operation relates to detection of received signal)
&D[]
6.2.9 mand. determines how TA responds when ITU-T V.24 circuit 108/2 (or
equivalent) is changed from ON to OFF condition during online data
state
+IPR=[]
6.2.10 opt. fixed TE data rate (recommended default 0 i.e. automatic detection)
+ICF=[
6.2.11 opt. TE-TA character framing (recommended default 3,3 i.e. eight data
[,]]
bits, no parity, 1 stop bit)
+IFC=[
6.2.12 opt. TE-TA local flow control (recommended default 2,2 i.e. TE uses ITU-T
[,]]
V.24 circuit 133 (or equivalent), and TA circuit 106 (or equivalent))
+ILRR=[
6.2.13 opt. determines whether the used local TE-TA data rate is informed using
]
intermediate result code +ILRR:  before going online data
state after call answering or originating
5 General commands
ITU-T Recommendation V.25ter [14] includes 'Generic DCE Control' commands with the prefix +G. These
commands are for the identification of the TA. Four of those commands are adapted here to be the
+CG
identification commands of the ME. Syntax is otherwise similar but the prefix is . TIA IS-99 [15] uses
same commands for ME identification.
5.1 Request manufacturer identification +CGMI
Table 2: +CGMI action command syntax
Command Possible response(s)
+CGMI
+CME ERROR:
+CGMI=?
Description
Execution command causes the TA to return one or more lines of information text ,
determined by the ME manufacturer, which is intended to permit the user of the TA to identify the
manufacturer of the ME to which it is connected to. Typically, the text will consist of a single line containing
the name of the manufacturer, but manufacturers may choose to provide more information if desired.
Refer subclause 9.2 for possible values.

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Defined values
: the total number of characters, including line terminators, in the information text shall
not exceed 2048 characters.
Text shall not contain the sequence 0 or OK
Implementation
Optional.
5.2 Request model identification +CGMM
Table 3: +CGMM action command syntax
Command Possible response(s)
+CGMM
+CME ERROR:
+CGMM=?
Description
Execution command causes the TA to return one or more lines of information text , determined
by the ME manufacturer, which is intended to permit the user of the TA to identify the specific model of the
ME to which it is connected to. Typically, the text will consist of a single line containing the name of the
product, but manufacturers may choose to provide more information if desired. Refer subclause 9.2 for
possible values.
Defined values
: the total number of characters, including line terminators, in the information text shall not
exceed 2048 characters.
Text shall not contain the sequence 0 or OK
Implementation
Optional.
5.3 Request revision identification +CGMR
Table 4: +CGMR action command syntax
Command Possible response(s)
+CGMR
+CME ERROR:
+CGMR=?
Description
Execution command causes the TA to return one or more lines of information text ,
determined by the ME manufacturer, which is intended to permit the user of the TA to identify the version,
revision level or date, or other pertinent information of the ME to which it is connected to. Typically, the
text will consist of a single line containing the version of the product, but manufacturers may choose to
provide more information if desired. Refer subclause 9.2 for possible values.

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Defined values
: the total number of characters, including line terminators, in the information text shall not
exceed 2048 characters.
Text shall not contain the sequence 0 or OK
Implementation
Optional.
5.4 Request product serial number identification +CGSN
Table 5: +CGSN action command syntax
Command Possible response(s)
+CGSN
+CME ERROR:
+CGSN=?
Description
Execution command causes the TA to return one or more lines of information text , determined by
the ME manufacturer, which is intended to permit the user of the TA to identify the individual ME to which
it is connected to. Typically, the text will consist of a single line containing the IMEI (International Mobile
station Equipment Identity; refer GSM 03.03 [7]) number of the ME, but manufacturers may choose to
provide more information if desired. Refer subclause 9.2 for possible values.
Defined values
: the total number of characters, including line terminators, in the information text shall not exceed
2048 characters.
Text shall not contain the sequence 0 or OK
Implementation
Optional.
5.5 Select TE character set +CSCS
Table 6: +CSCS parameter command syntax
Command Possible response(s)
+CSCS=[]
+CSCS? +CSCS:
+CSCS=?
+CSCS: ( )
list of supported s
Description
Set command informs TA which character set is used by the TE. TA is then able to convert
character strings correctly between TE and ME character sets.
When TA-TE interface is set to 8-bit operation and used TE alphabet is 7-bit, the highest bit shall be set to
zero.
NOTE: It is manufacturer specific how the internal alphabet of ME is converted to/from the TE
alphabet.
Read command shows current setting and test command displays conversion schemes implemented in
the TA.
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ETS 300 642 (GSM 07.07 version 4.4.1): March 1999
Defined values
(conversion schemes not listed here can be defined by manufacturers):
"GSM" GSM default alphabet (GSM 03.38 subclause 6.2.1); this setting causes easily software
flow control (XON/XOFF) problems
"HEX" character strings consist only of hexadecimal numbers from 00 to FF; e.g. "032FE6"
equals three characters with decimal values 3, 47 and 230
NOTE: If ME is using GSM default alphabet, its characters shall be padded with 8th bit (zero)
before converting them to hexadecimal numbers (i.e. no SMS-style packing of 7-bit
alphabet).
"IRA" international reference alphabet (ITU-T T.50 [13])
"PCCPxxx" PC character set Code Page xxx
"PCDN" PC Danish/Norwegian character set
"8859-n" ISO 8859 Latin n (1-6) character set
"8859-C" ISO 8859 Latin/Cyrillic character set
"8859-A" ISO 8859 Latin/Arabic character set
"8859-G" ISO 8859 Latin/Greek character set
"8859-H" ISO 8859 Latin/Hebrew character set
Implementation
Mandatory when a command using the setting of this command is implemented.
5.6 ITU-T V.25ter [14] generic TA control commands
Table 7: V.25ter generic TA control commands
Command Section Impl. Use in GSM
Z[]
6.1.1 mand. TA sets all parameters to their defaults as specified by a user
memory profile or by the manufacturer, and resets TA
&F[]
6.1.2 mand. TA sets all parameters to their defaults as specified by the
manufacturer
I[]
6.1.3 opt. request manufacturer specific information about the TA
(software cannot use this command to determine the
capabilities of a TA)
+GMI
6.1.4 mand. request TA manufacturer identification (may equal to +CGMI)
+GMM
6.1.5 mand. request TA model identification (may equal to +CGMM)
+GMR
6.1.6 mand. request TA revision identification (may equal to +CGMR)
+GSN
6.1.7 opt. request TA serial number identification (may equal to +CGSN)
+GOI
6.1.8 opt. request ISO system global object identification of the TA
(general format defined in ITU-T Recommendation X.208;
encoding rules in ITU-T Recommendation X.209)
+GCAP
6.1.9 mand. request overall capabilities of TA; the response code for a TA
building on this document shall be +CGSM
+GCI=
6.1.10 opt. selects the country of installation for the TA using ITU-T
Recommendation T.35 Annex A country codes
5.7 PCCA STD-101 [17] select wireless network +WS46
PCCA STD-101 [17] includes a command to select the cellular network (Wireless Data Service; WDS) to
operate with the TA. PCCA calls this as WDS-Side Stack Selection. This command may be used when TA
is asked to indicate the networks in which it can operate.

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Table 8: +WS46 parameter command syntax
Command Possible response(s)
+WS46=[]
+WS46?
+WS46=?
(list of supported s)
Description
Set command selects to WDS side stack to be used by the TA. Read command shows current
setting and test command displays side stacks implemented in the TA.
Defined values
:
12 GSM digital cellular
refer PCCA STD-101 [17] for other values
Implementation
Mandatory in PCCA STD-101, but optional for GSM.
5.8 Informative examples
When beginning to build a communication link, a general TE application controlling a TA needs to
determine the TA and the ME to which it is connected. V.25ter [14] has seven commands for TA
identification from which four are mandatory to be implemented in a TA. An example of this command
sequence requesting manufacturer (+GMI), model (+GMM), revision (+GMR) and serial number (+GSN)
information would be:
AT+GMI
Manufacturer ABC
OK
AT+GMM
GSM Ultimate Data Device
OK
AT+GMR
1.00
OK
AT+GSN
987612345-123
OK
The maximum lengths of the information responses are defined to be 2048 characters, but it is
recommended that they are kept as simple as in the example. The serial number command is defined as
optional. Another optional command is Global Object Identification command (+GOI) which should return
the object identifiers of ITU-T Recommendation X.208 as numeric strings delimited by periods. The
Complete Capabilities List command (+GCAP) should indicate the major capability areas of the TA. The
support of different areas is presented in the response of +GCAP command. Each area may be presented
by the selection command name of a specific capability area (e.g. +FCLASS for fax support) or some other
predefined response. For instance, a GSM TA with fax capabilities could respond as follows:
AT+GCAP
+GCAP: +CGSM,+FCLASS,+W
OK
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+CGSM
The first supported area in the response is presented with . It is the proposed response text to
+FCLASS
show that some or all GSM commands of this ETS are supported. Second response text ( )
+W
informs that some fax or voice capabilities are present, and the third text ( ) about the presence of
+FCLASS=?
wireless commands as specified by PCCA STD-101 [17]. Command (refer e.g. ITU-T T.31
+WS46=?
[11] and T.32 [12]) should be used to query the supported fax capabilities and to query the
wireless data services available:
AT+FCLASS=?;+WS46=?
0,1,2,2.0
(12)
OK
The TA of this example supports GSM data services, and fax service class 1 (TIA-578-A), 2
(manufacturer specific) and 2.0 (ITU-T T.32 [12]/ TIA-592).
This ETS defines commands for ME identification which are similar to those for TA identification in V.25ter
[14], for an example:
AT+CGMI
Mobile Manufacturer XYZ
OK
AT+CGMM
GSM Phone 1234
OK
AT+CGMR
1.00
OK
AT+CGSN
OK
Manufacturer, model and version commands work similarly as for TA, except that the serial number query
returns the International Mobile Station Equipment Identity (IMEI) number. IMEI is fifteen digits long and
consists of a type approval code, a final assembly code, a serial number and a spare digit (refer GSM
03.03 [7]). When the TA is implemented inside ME, the responses for both TA and ME queries will most
likely follow the responses of ME identification.

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6 Call control commands and methods
This clause describes the control of GSM calls. Normal data and fax call control is done as in ITU-T
Recommendations V.25ter [14], T.31 [11] and T.32 [12]. For voice call originating, refer subclause ‘ITU-T
V.25ter dial command D’.
6.1 Select type of address +CSTA
Table 9: +CSTA parameter command syntax
Command Possible response(s)
+CSTA=[]
+CSTA? +CSTA:
+CSTA=?
+CSTA: (list of supported s)
Description
Set command selects the type of number for further dialing commands (D) according to GSM
specifications. Test command returns values supported by the TA as a compound value.
Defined values
: type of address octet in integer format (refer GSM 04.08 [8] subclause 10.5.4.7); default 145
when dialing string includes international access code character ‘+’, otherwise 129
Implementation
Mandatory when other than default value allowed.
6.2 ITU-T V.25ter [14] dial command D
V.25ter [14] dial command D lists characters that may be used in a dialling string for making a call or
controlling supplementary services in accordance with GSM 02.30 [19]. Their use in GSM is listed in this
subclause, as well as new dial modifiers applicable only to GSM are introduced. For a ME supporting AT
commands only, it is mandatory to support the control of supplementary services in accordance with GSM
02.30 through the dial command or through the specific supplementary service commands (+CCFC,
+CLCK, etc.), where GSM 02.30 identifies the supplementary services as mandatory.
V.25ter dialing digits
1 2 3 4 5 6 7 8 9 0 * # + A B C (implementation of these characters is mandatory for GSM)
D (implementation of this character is optional for GSM, and it is ignored)
V.25ter modifier characters
, (implementation of this character is mandatory for GSM, but it may be ignored)
T P (implementation of these characters is mandatory for GSM, but they are ignored)
! W @ (implementation of these characters is optional for GSM, and they are ignored)
V.25ter semicolon character
In GSM, when semicolon character is given after dialing digits (or modifiers), a voice call originated to the
given address. TA returns to command state immediately (or after possible +COLP result code; refer
subclause ‘Connected line identification presentation +COLP’). Refer Annex G for a detailed example.

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GSM modifier characters
> (refer subclause ‘Direct dialing from phonebooks’)
I or i (override the CLIR supplementary service subscription default value for this call; refer subclause
‘Calling line identification restriction +CLIR’)
G or g (control the CUG supplementary service information for this call; uses index and info values set
with command +CCUG; refer subclause ‘Closed user group +CCUG’)
6.3 Direct dialing from phonebooks
...