Multitech MMCModem GPRS (MTMMC-G) User manual

Wireless GSM/GPRS Modems
MultiModem®GPRS (MTCBA-G)
MMCModem™GPRS (MTMMC-G)
SocketModem®GPRS (MTSMC-G)
AT Commands
Reference Guide

Copyright and Technical Support
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 2
AT Commands for Wireless GSM/GPRS Modems
Reference Guide
These Commands Apply to the Following Products:
MultiModem®GPRS (MTCBA-G)
MultiModem®GPRS-USB (MTCBA-G-U)
MultiModem®GPRS with Ethernet Interface (MTCBA-G-EN)
MMCModem™GPRS (MTMMC-G)
SocketModem®GPRS (MTSMC-G)
PN S000293I, Revision I
Copyright
This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech
Systems, Inc. All rights reserved. Copyright © 2003-2008, by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech
Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof
without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.
Revisions
Revision Level Date Description
A 07/15/03 Initial release.
B 03/08/04 Added Values to each command. Added new commands.
C 09/28/04 Changed data/fax call to ATD<nb>; and voice call to ATD<nb>
Changed Autobauding is supported (operating from 2400 to 115200)
D 08/04/05 Added “Length of Phone Numbers” section to Chapter 3. Changed maximum length of
phone numbers to 60 digits. Added <mode> to +CMGF values. Added new command,
+CMMS. Removed values 2 and 4 from \N. Increased I/O ports to ten in the index value
of +WIOR and +WIOW. Added more text to +WRIM. Removed one note from +CGCONT.
Changed the font size from 10 point to 9 point; this brought the manual under 200 pages.
E 01/23/06 Added ®and ™to products listed on the cover.
F 05/10/07 Added the +WMBS, a command that supports quad band builds. Updated the Technical
Support contact list.
G 08/24/07 Updated the +WIND command.
H 01/16/08 Updated the cover and MMCModem product name.
I 09/25/08 Updated the +ECHO commands and removed Fax commands. Removed all references to
HR (Half Rate). Added four new Phonebook commands: WCOS, WPGW, WPGR, WPGS.
Added SMS Command: WMCP. Updated to version 6.57d.
Trademarks
MultiModem, SocketModem, and the Multi-Tech logo are registered trademarks of Multi-Tech Systems, Inc.
MMCModem is a trademark of Multi-Tech Systems, Inc.
Technical Support
Country By Email By Phone
Europe, Middle East, Africa: [email protected] +(44) 118 959 7774
U.S., Canada, all others: [e-mail] 800-972-2439 or 763-717-5863
World Headquarters
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
Phone: [phone] or 800-328-9717
Fax: [phone]
Internet Address: http://www.multitech.com

Table of Contents
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 3
Contents
Chapter 1 – Introduction................................................................................................................................................9
Scope of This Document............................................................................................................................................9
Related Documents....................................................................................................................................................9
Definitions ..................................................................................................................................................................9
Chapter 2 – AT Command Features ...........................................................................................................................10
Line Settings ............................................................................................................................................................10
Command Line.........................................................................................................................................................10
Information Responses and Result Codes...............................................................................................................10
Chapter 3 – General Behaviors...................................................................................................................................11
SIM Card Insertion and Removal Procedures..........................................................................................................11
Background Initialization ..........................................................................................................................................11
About the Length of Phone Numbers.......................................................................................................................11
Chapter 4 – General AT Commands...........................................................................................................................13
Manufacturer Identification +CGMI.........................................................................................................................13
Request Model Identification +CGMM....................................................................................................................13
Request Revision Identification +CGMR................................................................................................................13
Product Serial Number +CGSN..............................................................................................................................14
Select TE Character Set +CSCS............................................................................................................................14
Phonebook Character Set +WPCS........................................................................................................................14
Request IMSI +CIMI...............................................................................................................................................15
Card Identification +CCID.......................................................................................................................................15
Capabilities List +GCAP.........................................................................................................................................15
Repeat Last Command A/.......................................................................................................................................15
Power Off +CPOF...................................................................................................................................................16
Set Phone Functionality +CFUN ............................................................................................................................16
Phone Activity Status +CPAS.................................................................................................................................17
Report Mobile Equipment Errors +CMEE...............................................................................................................17
Keypad Control +CKPD .........................................................................................................................................17
Clock Management +CCLK....................................................................................................................................18
Alarm Management +CALA....................................................................................................................................18
Chapter 5 – Call Control Commands..........................................................................................................................19
Dial Command D....................................................................................................................................................19
Hang-Up Command H............................................................................................................................................20
Answer a Call A......................................................................................................................................................21
Remote Disconnection.............................................................................................................................................21
Extended Error Report +CEER ..............................................................................................................................21
DTMF Signals +VTD, +VTS...................................................................................................................................21
Redial Last Telephone Number DL........................................................................................................................22
Automatic Dialing with DTR %D.............................................................................................................................23
Automatic Answer S0.............................................................................................................................................23
Incoming Call Bearer +CICB..................................................................................................................................24
Single Numbering Scheme +CSNS........................................................................................................................24
Gain Control +VGR, +VGT.....................................................................................................................................24
Microphone Mute Control +CMUT..........................................................................................................................26
Speaker & Microphone Selection +SPEAKER.......................................................................................................26
Echo Cancellation +ECHO.....................................................................................................................................27
SideTone Modification +SIDET..............................................................................................................................30
Initialize Voice Parameters +VIP............................................................................................................................30

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Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 4
Chapter 6 – Network Service Commands ..................................................................................................................31
Signal Quality +CSQ ...............................................................................................................................................31
Operator Selection +COPS....................................................................................................................................31
Network Registration +CREG.................................................................................................................................33
Operator List Management +WOLM ......................................................................................................................33
Read Operator Name +WOPN................................................................................................................................34
Selection of Preferred PLMN List +CPLS...............................................................................................................36
Preferred Operator List +CPOL..............................................................................................................................37
Read Operator Name +COPN................................................................................................................................39
Chapter 7 – Security Commands................................................................................................................................40
Enter PIN +CPIN....................................................................................................................................................40
Enter PIN2 +CPIN2................................................................................................................................................42
PIN Remaining Attempt Number +CPINC..............................................................................................................42
Facility Lock +CLCK...............................................................................................................................................43
Change Password +CPWD....................................................................................................................................44
Chapter 8 – Phonebook Commands ..........................................................................................................................45
Introduction to Phonebook Commands....................................................................................................................45
About the Parameters ..............................................................................................................................................45
Select Phonebook Memory Storage +CPBS...........................................................................................................46
Read Phonebook Entries +CPBR ..........................................................................................................................47
Write Phonebook Entry +CPBW.............................................................................................................................49
Find Phonebook Entries +CPBF ............................................................................................................................52
Phonebook Phone Search +CPBP.........................................................................................................................53
Move Action in Phonebook +CPBN........................................................................................................................54
Subscriber Number +CNUM...................................................................................................................................55
Avoid Phonebook Initialization +WAIP...................................................................................................................56
Delete Calls Phonebook +WDCP...........................................................................................................................56
Set Voice Mail Number +CSVM..............................................................................................................................56
Contact Selector +WCOS........................................................................................................................................57
Create and Delete a Phonebook Group +WPGW...................................................................................................57
Read a Phonebook Group +WPGR ........................................................................................................................58
Settings of a Phonebook Group +WPGS ................................................................................................................59
Chapter 9 – Short Messages .......................................................................................................................................60
Parameters Definition...............................................................................................................................................60
Select Message Service +CSMS ............................................................................................................................61
New Message Acknowledgement +CNMA.............................................................................................................61
Preferred Message Storage +CPMS......................................................................................................................63
Preferred Message Format +CMGF.......................................................................................................................64
Save Settings +CSAS ............................................................................................................................................65
Restore Settings +CRES........................................................................................................................................65
Show Text Mode Parameters +CSDH.....................................................................................................................65
New Message Indication +CNMI............................................................................................................................66
Read Message +CMGR.........................................................................................................................................68
List Message +CMGL.............................................................................................................................................69
Send Message +CMGS .........................................................................................................................................70
Write Message to Memory +CMGW.......................................................................................................................71
Send Message from Storage +CMSS....................................................................................................................72
Set Text Mode Parameters +CSMP........................................................................................................................72
Delete Message +CMGD .......................................................................................................................................73
Service Center Address +CSCA ............................................................................................................................74
Select Cell Broadcast Message Types +CSCB......................................................................................................74

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Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 5
Cell Broadcast Message Identifiers +WCBM..........................................................................................................75
Message Status Modification +WMSC...................................................................................................................75
Message Overwriting +WMGO...............................................................................................................................76
Change or Do Not Change SMS Status +WUSS...................................................................................................77
Copy Messages +WMCP.......................................................................................................................................78
More Messages to Send +CMMS ..........................................................................................................................79
Chapter 10 – Supplementary Services Commands ..................................................................................................80
Call Forwarding +CCFC..........................................................................................................................................80
Call Barring +CLCK................................................................................................................................................81
Modify SS Password +CPWD................................................................................................................................81
Call Waiting +CCWA..............................................................................................................................................82
Calling Line Identification Restriction +CLIR ..........................................................................................................83
Calling Line Identification Presentation +CLIP .......................................................................................................83
Connected Line Identification Presentation +COLP ...............................................................................................84
Advice of Charge +CAOC ......................................................................................................................................85
Accumulated Call Meter +CACM............................................................................................................................85
Accumulated Call Meter Maximum +CAMM...........................................................................................................86
Price Per Unit and Currency Table +CPUC............................................................................................................86
Call Related Supplementary Services +CHLD.......................................................................................................87
List Current Calls +CLCC.......................................................................................................................................88
Supplementary Service Notifications +CSSN.........................................................................................................89
Unstructured Supplementary Service Data +CUSD...............................................................................................90
Closed User Group +CCUG....................................................................................................................................91
Chapter 11 – Data Commands ....................................................................................................................................92
Using AT Commands During a Data Connection.....................................................................................................92
Bearer Type Selection +CBST...............................................................................................................................93
Select Mode +FCLASS ..........................................................................................................................................94
Service Reporting Control +CR...............................................................................................................................94
Cellular Result Codes +CRC..................................................................................................................................95
DTE-DCE Local Rate Reporting +ILRR..................................................................................................................95
Radio Link Protocol Parameters +CRLP................................................................................................................96
Other Radio Link Parameters +DOPT.....................................................................................................................96
Select Data Compression %C.................................................................................................................................97
V42bis Data Compression +DS..............................................................................................................................97
V42bis Data Compression Report +DR..................................................................................................................98
Select Data Error Correcting Mode \N....................................................................................................................98
Chapter 12 – V.24 and V.25 Commands .....................................................................................................................99
Fixed DTE Rate +IPR.............................................................................................................................................99
DTE-DCE Character Framing +ICF......................................................................................................................100
DTE-DCE Local Flow Control +IFC......................................................................................................................101
Set DCD Signal &C..............................................................................................................................................101
Set DTR Signal &D...............................................................................................................................................102
Set DSR Signal &S...............................................................................................................................................102
Back to Online Mode O.........................................................................................................................................102
Result Code Suppression Q.................................................................................................................................102
DCE Response Format V.....................................................................................................................................103
Default Configuration Z ........................................................................................................................................103
Save Configuration &W.........................................................................................................................................103
Auto-Tests &T ......................................................................................................................................................104
Echo E..................................................................................................................................................................104
Restore Factory Settings &F ................................................................................................................................104

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Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 6
Display Configuration &V .....................................................................................................................................105
Request Identification Information I......................................................................................................................105
Multiplexing Mode +WMUX...................................................................................................................................106
Chapter 13 – Specific AT Commands ......................................................................................................................107
Cell Environment Description +CCED..................................................................................................................107
General Indications +WIND..................................................................................................................................109
Analog Digital Converter Measurements +ADC....................................................................................................111
Mobile Equipment Event Reporting +CMER ........................................................................................................112
Read Language Preference +WLPR....................................................................................................................113
Write Language Preference +WLPW ...................................................................................................................113
Read GPIO Value +WIOR.....................................................................................................................................114
Write GPIO Value +WIOW...................................................................................................................................114
Input/Output Management +WIOM ......................................................................................................................115
Abort Command +WAC........................................................................................................................................116
Play Tone +WTONE.............................................................................................................................................117
Play DTMF Tone +WDTMF..................................................................................................................................118
Downloading +WDWL..........................................................................................................................................118
Voice Rate +WVR .................................................................................................................................................119
Data Rate +WDR .................................................................................................................................................120
Select Voice Gain +WSVG...................................................................................................................................121
Status Request +WSTR.......................................................................................................................................121
Scan +WSCAN.....................................................................................................................................................122
Ring Indicator Mode +WRIM................................................................................................................................122
32kHz Power Down Mode +W32K.......................................................................................................................123
Change Default Melody +WCDM.........................................................................................................................123
Custom Character Set +WCCS............................................................................................................................124
Lock +WLCK........................................................................................................................................................125
CPHS Command +CPHS.....................................................................................................................................126
Unsolicited Result: Voice Mail Indicator +WVMI...................................................................................................128
Unsolicited Result: Diverted Call Indicator +WDCI...............................................................................................128
Network Operator Name +WNON........................................................................................................................129
CPHS Information +WCPI....................................................................................................................................129
Customer Service Profile +WCSP.........................................................................................................................130
Customer Storage Mirror +WMIR.........................................................................................................................130
Change Default Player +WCDP............................................................................................................................130
CPHS Mail Box Number +WMBN ........................................................................................................................131
Alternate Line Service +WALS.............................................................................................................................132
Wavecom Open AT Control Command +WOPEN ...............................................................................................133
Reset +WRST......................................................................................................................................................135
Set Standard Tone +WSST..................................................................................................................................135
Hang-up +WATH..................................................................................................................................................136
Multi-Band Selection +WMBS..............................................................................................................................137
Chapter 14 – SIM Toolkit ...........................................................................................................................................138
Overview of SIM Application Toolkit.......................................................................................................................138
Messages Exchanged During a SIM Toolkit Operation..........................................................................................139
SIM Toolkit Commands..........................................................................................................................................140
SIM Toolkit Set Facilities +STSF..........................................................................................................................140
SIM Toolkit Indication +STIN or +STRIL ..............................................................................................................142
SIM Toolkit Get Information +STGI......................................................................................................................143
Unsolicited Result: SIM Toolkit Control Response +STCR ..................................................................................146
SIM Toolkit Give Response +STGR.....................................................................................................................146

Table of Contents
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 7
Chapter 15 – GPRS commands ................................................................................................................................149
Define PDP Context +CGDCONT........................................................................................................................149
Quality of Service Profile Requested +CGQREQ..................................................................................................151
Quality of Service Profile Minimum Acceptable +CGQMIN..................................................................................154
GPRS Attach or Detach +CGATT........................................................................................................................155
PDP Context Activate or Deactivate +CGACT.....................................................................................................156
Enter Data State +CGDATA.................................................................................................................................157
GPRS Mobile Station Class +CGCLASS .............................................................................................................158
Select Service for MO SMS Messages +CGSMS................................................................................................159
GPRS Event Reporting +CGEREP......................................................................................................................160
GPRS Network Registration Status +CGREG......................................................................................................161
Request GPRS IP Service D................................................................................................................................162
Network Requested PDP Context Activation..........................................................................................................163
Automatic Response to a Network Request for PDP Context Activation +CGAUTO ...........................................164
Manual Response to a Network Request for PDP Context Activation +CGANS..................................................165
Show PDP Address +CGPADDR.........................................................................................................................166
Cellular Result Codes +CRC................................................................................................................................166
Service Reporting Control +CR............................................................................................................................167
Extended Error Report +CEER ............................................................................................................................167
GPRS Parameters Customization +WGPRS .......................................................................................................168
Examples of Full GPRS AT Commands.................................................................................................................170
Chapter 16 – Other AT Commands...........................................................................................................................171
V.25ter Recommendation.......................................................................................................................................171
GSM 07.05 Recommendation................................................................................................................................171
GSM 07.07 Recommendation...............................................................................................................................171
Appendix A – Result Codes, Failure Causes, Other Tables ...................................................................................172
Chapter Summary..................................................................................................................................................172
ME Error Result Code: +CME ERROR: <error>...................................................................................................173
Message Service Failure Result Code +CMS ERROR .........................................................................................174
Specific Error Result Codes ...................................................................................................................................174
Failure Cause from GSM 04.08 Recommendation +CEER...................................................................................176
Specific Failure Cause for +CEER.........................................................................................................................177
GSM 04.11 Annex E-2: Mobile Originating SM-Transfer.......................................................................................178
Unsolicited Result Codes.......................................................................................................................................179
Final Result Codes.................................................................................................................................................179
Intermediate Result Codes.....................................................................................................................................179
Parameter Storage Mode.......................................................................................................................................180
GSM Sequences List..............................................................................................................................................182
CPHS Information Field..........................................................................................................................................184
CSP Constants.......................................................................................................................................................185
Appendix B - ME SIM Toolkit Support......................................................................................................................187
Appendix C – Structure of the Terminal Profile ......................................................................................................188
Appendix D – Command Type and Next Action Indicator .....................................................................................190
Appendix E – Coding of Alpha fields in the SIM for UCS2.....................................................................................191
Appendix F – Command Execution and Dependence on SIM................................................................................193
General Commands...............................................................................................................................................193
Call Control Commands.........................................................................................................................................193
Network Service Commands..................................................................................................................................194
Security Commands...............................................................................................................................................194
Phonebook Commands..........................................................................................................................................194
Short Messages Commands..................................................................................................................................194

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Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 8
Supplementary Services Commands.....................................................................................................................195
Data Commands ....................................................................................................................................................195
V24-V25 Commands..............................................................................................................................................195
Specific AT Commands..........................................................................................................................................196
SIM Toolkit Commands..........................................................................................................................................196
GPRS Commands..................................................................................................................................................197
Index ...........................................................................................................................................................................198

Chapter 1 – Introduction
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 9
Chapter 1 – Introduction
Scope of This Document
This document describes the AT-command based messages exchanged between an application and the Multi-Tech Systems,
Inc. products in order to manage GSM-related events or services.
Related Documents
This interface specification is based on the following recommendations:
[1] ETSI GSM 07.05: Digital cellular telecommunications system (Phase 2);
Use of DTE-DCE interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)
[2] ETSI GSM 07.07: Digital cellular telecommunications system (Phase 2);
AT command set for GSM Mobile Equipment (ME)
[3] ITU-T Recommendation V.25 ter: Serial asynchronous automatic dialing and control
[4] ETSI GSM 03.40: Digital cellular telecommunications system (Phase 2);
Technical implementation of the Short Message Service (SMS) Point-to-Point (PP)
[5] ETSI GSM 03.38: Digital cellular telecommunications system (Phase 2);
Alphabets and language-specific information
[6] ETSI GSM 04.80: Digital cellular telecommunications system (Phase 2):
Mobile radio interface layer 3, Supplementary service specification, Formats and coding
Definitions
The words, “Mobile Station” (MS) or “Mobile Equipment” (ME) are used for mobile terminals supporting GSM services.
Terminal Equipment (TE) is the Man-Machine Interface of a GSM device (modem or handset). A TE can be a hanset
MMI or the AT Command interface.
A call from a GSM mobile station to the PSTN is called a “mobile originated call” (MOC) or “outgoing call”, and a call
from a fixed network to a GSM mobile station is called a “mobile terminated call” (MTC) or “incoming call”.
In this document, the word “product” refers to any Multi-Tech product supporting the AT commands interface.

Chapter 2 – AT Command Features
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 10
Chapter 2 – AT Command
Features
Line Settings
A serial link handler is set with the following default values (factory settings):
•Autobaud
•8 bits data
•1 stop bit
•no parity
•RTS/CTS flow control
Please use the +IPR, +IFC and +ICF commands to change these settings.
Command Line
Commands always start with AT (which means ATtention) and finish with a <CR> character.
Information Responses and Result Codes
Responses start and end with <CR><LF>, except for the ATV0 DCE response format and the ATQ1 (result code
suppression) commands.
•If the command syntax is incorrect, an ERROR string is returned.
•If the command syntax is correct but transmitted with the wrong parameters, the +CME ERROR: <Err> or +CMS
ERROR: <SmsErr> strings are returned with adequate error codes if the CMEE was previously set to 1. By
default, CMEE us set to 0, and the error message is only “ERROR”.
•If the command line has been performed successfully, an OK string is returned.
In some cases, such as “AT+CPIN?” or (unsolicited) incoming events, the product does not return the OK string as a
response.

Chapter 3 – General Behaviors
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 11
Chapter 3 – General Behaviors
SIM Card Insertion and Removal Procedures
SIM card Insertion and Removal procedures are supported. Software functions rely on positive reading of the hardware
SIM detect pin. This pin state (open/closed) is permanently monitored.
When the SIM detect pin indicates that a card is present in the SIM connector, the product tries to set up a logical SIM
session. The logical SIM session will be set up or not depending on whether the detected card is a SIM Card or not. The
AT+CPIN? command delivers the following responses:
•If the SIM detect pin indicates “absent”, the response to AT+CPIN? is “+CME ERROR 10” (SIM not inserted).
•If the SIM detect pin indicates “present”, and the inserted Card is a SIM Card, the response to AT+CPIN? is
“+CPIN: xxx” depending on SIM PIN state.
•If the SIM detect pin indicates “present”, and the inserted Card is not a SIM Card, the response to AT+CPIN? is
CME ERROR 10.
•These last two states are not given immediately due to background initialization. Between the hardware SIM
detect pin indicating “present” and the previous results the AT+CPIN? sends “+CME ERROR: 515” (Please wait,
init in progress).
When the SIM-detect pin indicates card absence, and if a SIM Card was previously inserted, an IMSI detach procedure is
performed, all user data is removed from the product (Phonebooks, SMS etc.). The product then switches to emergency
mode.
When the hardware SIM detect pin is not managed, the software cannot know the state of the SIM (SIM inserted or SIM
removed) except for the initialization of the modem. In this case, the SIM must be present in the rack before the
initialization of the modem can be taken into account.
If the SIM is removed and it had been detected at the time of initialization of the modem, the following message is
displayed: +CME ERROR: 13. If the SIM is inserted in the rack and it was not present at the time of the initialization of the
modem, the state of the SIM remains unchanged (SIM removed). It will have to initialize the modem again so that it is
detected.
Background Initialization
After entering the PIN (Personal Identification Number), some SIM user data files are loaded into the product
(Phonebooks, SMS status, etc.). Please be aware that it might take some time to read a large phonebook.
The AT+CPIN? command response comes just after the PIN is checked. After this response user data is loaded (in
background). This means that some data may not be available just after PIN entry is confirmed by ’OK’. The reading of
phonebooks will then be refused by “+CME ERROR: 515” or “+CMS ERROR: 515” meaning, “Please wait, service is not
available, init in progress”.
This type of answer may be sent by the product at several points:
•When trying to execute another AT command before the previous one is completed (before response),
•When switching from ADN to FDN (or FDN to ADN) and trying to read the relevant phonebook immediately,
•When asking for +CPIN? status immediately after SIM insertion and before the product has determined if the
inserted card is a valid SIM Card.
About the Length of Phone Numbers
Phone numbers can consist of up to 60 digits. The first 20 digits are stored in the SIM in the phonebook file (EFADN, EFFDN
or EFLND) corresponding to the selected phonebook. The next digits are stored in other extension SIM files (EFEXT1 or
EFEXT2).
Example:
Number of Digits Nb of Records in EF
A
DN Nb of Records in EFEXT1
1 to 20 1 0
21 to 40 1 1
41 to 60 1 2
If there are no more free records in the EFEXT1, the behavior is:
•if the user tries to store an entry that exceeds 20 digits: +CME: 20
•if the user tries to dial an number that exceeds 20 digits: +CME: 20

Chapter 3 – General Behaviors
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 12
Since the maximum length for the numbers in the ADN, FDN, and LND phonebooks is 60 digits:
•if the user tries to dial a number that exceeds 60 digits: +CME: 3
Before the user can perform a call, the number of free records in the EFEXT1 is checked for availability of free space to
store this number.
•If there are free records left, the call is setup.
•Otherwise, +CME: 20 error is returned (Memory Full).
See Recommendation 3GPP 11.11 for more details.

Chapter 4 – General AT Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 13
Chapter 4 – General AT
Commands
Manufacturer Identification +CGMI
Description: Displays the manufacturer identification.
Values: No parameters
Syntax: AT+CGMI
Command Possible responses
AT+CGMI
Note: Get manufacturer identification
WAVECOM MODEM
OK
Note: Command valid, Wavecom modem
Request Model Identification +CGMM
Description: Displays the supported frequency bands. With multi-band products the response may be a combination
of different bands.
Values: No parameters
Syntax: AT+CGMM
Command Possible responses
AT+CGMM
Note: Get hardware version
MULTIBAND 900E 1800
OK
Note: Multiband: GSM 900 MHz extended band and DCS
1800 (default configuration)
AT+CGMM
Note: Get hardware version 900E OK
Note: 900 Extended
AT+CGMM
Note: Get hardware version 1800 OK
Note: DCS
AT+CGMM
Note: Get hardware version 1900 OK
Note: PCS
AT+CGMM
Note: Get hardware version G850 OK
Note: GSM 850
AT+CGMM
Note: Get hardware version MULTIBAND G850 1900 OK
Note: Multiband: GSM 850 and PCS
Request Revision Identification +CGMR
Description: Displays the revised software version.
Values: No parameters
Syntax: AT+CGMR
Command Possible responses
AT+CGMR
Note: Get software version
657_09gg.Q2406B 2015268 100506 17:01
OK
Note: Software release 6.57, generated on the 5th of October
2006

Chapter 4 – General AT Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 14
Product Serial Number +CGSN
Description: Allows the user application to get the IMEI (Interrnational Mobile Equipment Identity, 15-digit number) of
the product.
Values: No parameters
Syntax: AT+CGSN
Command Possible responses
AT+CGSN
Note: Get the IMEI
012345678901234
OK
Note: IMEI read from EEPROM
AT+CGSN
Note: Get the IMEI +CME ERROR: 22 Note: IMEI not found in EEPROM
Select TE Character Set +CSCS
Description: Informs the modem which character set is used by the DTE. The modem can convert each character of
entered or displayed strings. This is used to send, read or write short messages. See also +WPCS for
the phonebooks’ character sets.
Values: <Character Set>
GSM GSM default alphabet.
PCCP437 PC character set code page 437.
CUSTOM User defined character set (cf. +WCCS command).
HEX Hexadecimal mode. No character set used; the user can read or write hexadecimal
values.
Default: GSM alphabet
Syntax: AT+CSCS=<Character Set>
Command Possible responses
AT+CSCS=”GSM”
Note: GSM default alphabet OK Note: Command valid
AT+CSCS=”PCCP437”
Note: PC character set code OK Note: Command valid
AT+CSCS=?
Note: Get possible values
+CSCS: ("GSM","PCCP437","CUSTOM","HEX")
OK
Note: Possible values
Phonebook Character Set +WPCS
Description: Informs the modem which character set is used by the DTE for the phonebooks. The modem can
convert each character of entered or displayed strings. This is used to read or write phonebook entries.
See also +CSCS for the short messages character sets.
Values: <Character Set>
TRANSPARENT Transparent mode. The strings are displayed and entered as they are stored in
SIM or in ME.
CUSTOM User defined character set (cf. +WCCS command).
HEX Hexadecimal mode. No character set used; the user can read or write
hexadecimal values.
Syntax: AT+WPCS=<Character Set>
Command Possible responses
AT+WPCS=”TRANSPARENT”
Note: Transparent mode OK Note: Command valid
AT+WPCS=”CUSTOM”
Note: Custom character set OK Note: Command valid
AT+WPCS=?
Note: Get possible values
+WPCS: ("TRANSPARENT","HEX","CUSTOM")
OK
Note: Possible values

Chapter 4 – General AT Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 15
Request IMSI +CIMI
Description: Reads and identifies the IMSI (International Mobile Subscriber Identity) of the SIM card. The PIN may
need to be entered before reading the IMSI.
Values: No parameters
Syntax: AT+CIMI
Command Possible responses
AT+CIMI
Note: Read the IMSI 208200120320598 OK
Note: IMSI value (15 digits), starting with MCC (3 digits) / MNC (2 digits,
3 for PCS 1900)
Card Identification +CCID
Description: Orders the product to read the EF-CCID file on the SIM card.
Values: No parameters
Syntax: AT+CCID
Command Possible responses
AT+CCID
Note: Get card ID +CCID: “123456789AB111213141” Note: EF-CCID is present, hexadecimal format
AT+CCID?
Note: Get current value + CCID: “123456789AB111213141” Note: Same result as +CCID
AT+CCID= ?
Note: Get possible value OK Note: No parameter but this command is valid
Note: If there is no EF-CCID file present on the SIM, the +CCID answer will not be sent, but the OK message will
be returned.
Capabilities List +GCAP
Description: Displays the complete list of capabilities.
Values: No parameters
Syntax: AT+GCAP
Command Possible responses
AT+GCAP
Note: Get capabilities list
+GCAP: +CGSM +FCLASS
OK
Note: Supports GSM and FAX commands
Repeat Last Command A/
Description: Repeats the previous command. Only the A/ command itself cannot be repeated.
Values: No parameters
Syntax: A/
Command Possible responses
A/
Note: Repeat last command

Chapter 4 – General AT Commands
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Power Off +CPOF
Description: Stops the GSM software stack as well as the hardware layer or modem activity. The AT+CFUN=0
command is equivalent to +CPOF.
Values: No parameters
Syntax: AT+CPOF[=1]
Command Possible responses
AT+CPOF
Note: Stop GSM stack OK Note: Command valid
AT+CPOF=1
Note: Stop the modem OK Note: Command valid
Note: After AT+CPOF[=1], the modem will not respond to AT commands. To reset it, use the hard
reset.
Note: I n autobaud mode, after an AT+CPOF, unsolicited information that wakes up the modem is
sent at 9600 bps until an AT command is sent. When an AT command is sent, the modem
will synchronize to the sender’s speed.
Caution: When starting up, if autobauding is enabled and no AT command has yet been received, the
product sends all unsolicited responses (like RING) at 9600 baud.
Set Phone Functionality +CFUN
Description: Selects the mobile station’s level of functionality. When the application wants to stop the product with a
power off, or if the application wants to force the product to execute an IMSI DETACH procedure, then it
must send: AT+CFUN=0 (equivalent to AT+CPOF).
This command executes an IMSI DETACH and makes a backup copy of some internal parameters in
SIM and in EEPROM. The SIM card cannot then be accessed.
If the mobile equipment is not powered off by the application after this command has been sent, a re-
start command (AT+CFUN=1) will have to issued to restart the whole GSM registration process.
If the mobile equipment is turned off after this command, then a power on will automatically restart the
whole GSM process.
The AT+CFUN=1 command restarts the entire GSM stack and GSM functionality: a complete software
reset is performed. All parameters are reset to their previous values if AT&W was not used.
If you write entries in the phonebook (+CPBW) and then reset the product directly (AT+CFUN=1, with
no previous AT+CFUN=0 command), some entries may not be written (the SIM task does not have
enough time to write entries in the SIM card).
In addition, the OK response will be sent at the last baud rate defined by the +IPR command. With the
autobauding mode the response can be at a different baud rate, it is therefore preferable to save the
defined baud rate with AT&W before directly sending the AT+CFUN=1 command.
Values: <functionality level>
0Set minimum funtionality; IMSI detach procedure
1Set the full functionality mode with a complete software reset
Syntax: AT+CFUN=<functionality level>
Command Possible responses
AT+CFUN?
Note: Ask for current functionality level +CFUN: 1 OK
Note: Full functionality
AT+CFUN=0
Note: Set minimum functionality, IMSI detach procedure OK Note: Command valid
AT+CFUN=1
Note: Set the full functionality mode with a complete software reset OK Note: Command valid

Chapter 4 – General AT Commands
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Phone Activity Status +CPAS
Description: Returns the activity status of the mobile equipment.
Values: <pas>
0ready (allow commands from TA/TE)
1unavailable (does not allow commands)
2unknown
3ringing (ringer is active)
4call in progress
5asleep (low functionality)
Syntax: AT+CPAS
Command Possible responses
AT+CPAS
Note: Current activity status +CPAS: <pas> OK
Report Mobile Equipment Errors +CMEE
Description: Disables or enables the use of the “+CME ERROR: <xxx>” or “+CMS ERROR:<xxx>” result code
instead of simply “ERROR”. See the Appendix for +CME ERROR Result Codes description and +CMS
ERROR result codes.
Values: <error reporting flag>
0Disable ME error reports; use only << ERROR >>
1Enable <<+CME ERROR: <xxx> >> or
<< +CMS ERROR: <xxx> >>
Syntax: AT+CMEE=<error reporting flag>
Command Possible responses
AT+CMEE=?
+CMEE: (0,1) OK
AT+CMEE=0
Note: Disable ME error reports, use only << ERROR >> OK
AT+CMEE=1
Note: Enable << +CME ERROR: <xxx> << or
<< +CMS ERROR: <xxx> >>
OK
Keypad Control +CKPD
Description: Emulates the modem keypad by sending each keystroke as a character in a <keys> string.
The supported GSM sequences are listed in the Appendix A.
If emulation fails, a +CME ERROR: <err> is returned.
If emulation succeeds, the result depends on the GSM sequence activated.
Note: In the case where the FDN phonebook is activated, the sequences concerning “call forwarding”
are allowed only if the entire sequence is written in the FDN.
Values: <keys>
Keyboard sequence; string of the following characters (0-9, *, #)
Syntax: AT+CKPD=<keys>
Command Possible responses
AT+CKPD=”*#21#”
Note: Check every call forwarding status +CCFC: 0,7
AT+CKPD=”1234”
Note: Sequence not allowed +CME ERROR 3

Chapter 4 – General AT Commands
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Clock Management +CCLK
Description: Sets or gets the current date and time of the ME real-time clock.
Values: <date and time string>
String format for date/time is “yy/MM/dd,hh:mm:ss”
Note: Valid years are 98 (for 1998) to 97 (for 2097). The second field is not mandatory. Default
date/time is “98/01/01,00:00:00” (January 1st, 1998 / midnight).
Syntax: AT+CCLK=<date and time string>
Command Possible responses
AT+CCLK=”00/06/09,17:33:00”
Note: set date to June 9th, 2000, and
time to 5:33pm
OK
Note: Date/Time stored
AT+CCLK=”00/13/13,12:00:00”
Note: Incorrect month entered +CME ERROR 3
AT+CCLK?
Note: Get current date and time +CCLK: “00/06/09,17:34:23” OK
Note: current date is June 9th, 2000
current time is 5:34:23 pm
Alarm Management +CALA
Description: Sets the alarm date/time in the modem. The maximum number of alarms is 16.
Note: The date/time should be set with the AT+CCLK command prior to using AT+CALA.
Values: <date and time string> String format for alarms: “yy/MM/dd,hh:mm:ss” (see +CCLK)
Note: Seconds are taken into account.
<index> Offset in the alarm list, range 1 to 16
Syntax: AT+CALA=<date and time string> (set alarm)
AT+CALA=””,<index> (delete alarm)
Command Possible responses
AT+CALA=”00/06/09,07:30”
Note: set an alarm for June 9th, 2000 at 7:30 am OK
Note: Alarm stored
AT+CALA=”99/03/05,13:00:00”
Note: set an alarm for March 5th, 1999 at 1:00 pm +CME ERROR 3
Note: Invalid alarm (date/time expired)
AT+CALA?
Note: list all alarms
+CALA: “00/06/08,15:25:00”,1
+CALA: “00/06/09,07:30:00”,2
+CALA: “00/06/10,23:59:00”,3
Note: three alarms are set (index 1, 2, 3)
+CALA: “00/06/08,15:25:00”,1
Note: an alarm occurs (index 1)
AT+CALA=””,3
Note: delete alarm index 3 OK Note: Alarm index 3 deleted
AT+CALA?
Note: list all alarms +CALA: “00/06/09,07:30:00”,2 Note: Only one alarm (index 2)

Chapter 5 – Call Control Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 19
Chapter 5 – Call Control
Commands
Dial Command D
Description: The ATD command sets a voice or data call. As per GSM 02.30, the dial command also controls
supplementary services.
Data Calls
For a data call, the application sends the following ASCII string to the product (the bearer must be
previously selected with the +CBST command):
ATD<nb> where <nb> is the destination phone number. Note: If a GPRS PPP session is already
running, the setting of CSD (GSM data call) is not supported.
Voice Calls
For a voice call, the application sends the following ASCII string to the product: (the bearer may be
selected previously, if not a default bearer is used).
ATD<nb>; where <nb> is the destination phone number.
Emergency Calls
For emergency calls:
These Emergency Numbers are available without a SIM card:
000, 08, 110, 112, 118, 119, 911 and 999.
These Emergency Numbers are available with a SIM card:
When EF_ECC file is missing from SIM: 112 and 911.
When SIM includes an EF_ECC file: 112, 911 and any emergency numbers available in the
EF_ECC file.
International Numbers
For an international number, the local international prefix does not need to be set (usually 00) but does
need to be replaced by the ‘+’ character.
Example: to set up a voice call to Multi-Tech offices from another country, the AT command is:
“ATD+17637853600;”
Some countries/regions may have specific numbering rules for their GSM handset numbering.
Values: <nb> Destination phone number
<I> Optional parameter.
<I> means “invocation” (restrict CLI presentation)
<i> means “suppresssion” (allow CLI presentation)
<mem> Phonebook (one of SM, LD, MC, ON, ME, RC, MT or SN). A default value can be selected
by using the +CPBS command.
<index> Call number at indicated offset from the phonebook selected by the +CPBS command.
<name> Call number corresponding to given name from the phonebook selected by the +CPBS
command.
The response to the ATD command is one of the following:
V
erbose result code Numeric code
(with ATV0 set)
Description
OK 0 if the call succeeds, for voice call only
CONNECT <speed> 10,11,12,13,14,15 if the call succeeds, for data calls only, <speed> takes
the value negotiated by the product.
BUSY 7 If the called party is already in communication
NO ANSWER 8 If no hang up is detected after a fixed network time-out
NO CARRIER 3 Call setup failed or remote user release. Use the
AT+CEER command to know the failure cause

Chapter 5 – Call Control Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 20
Direct Dialing from a Phonebook (stored in the SIM card) can be performed with the following commands:
ATD> <index>; to call <index> from the selected phonebook (by the +CPBS command)
ATD> “BILL”; to call “BILL” from the selected phonebook
ATD> mem <index> allows direct dialing from a phonebook number
<mem> is SM, LD, MC, ME, RC, MT or SN.
See +CPBS command
Syntax: ATD<nb>[<I>][;]
ATD>[<mem>]<index>[<I>][;]
ATD>[<mem>]<name>[<I>][;]
Command Possible responses
AT+CPBS?
Note: Which phonebook is selected ? +CPBS:”SM”,8,10 Note: ADN phonebook is selected, 8
locations are used and 10 locations are
available
ATD>SM6;
Note: Call index 6 from AND phonebook OK Note: Call succeeds
When the FDN phonebook has been locked, only numbers beginning with the digits of FDN
phonebook entries can be called.
For example, if “014629” is entered in the FDN phonebook all the phone numbers beginning with these
6 digits can be called.
The CLIR supplementary service subscription can be overridden for this call only.
“I” means “invocation” (restrict CLI presentation).
“i” means “suppression” (allow CLI presentation).
Control of CUG supplementary service information by “G” or “g” is allowed for this call only. The
index and info values set with the +CCUG command are used.
An outgoing call attempt could be refused if the AOC service is active and credit has expired (NO
CARRIER).
When trying to set up an outgoing call while there is an active call, the active call is first put on hold,
then the call set up is carried out.
As per GSM 02.30, GSM sequences may be controlled using dial commands. These sequences can
contain “*”, “#”, but “;” is forbidden.
If the sequence is not supported or fails, +CME ERROR: <err> is returned. In the case, where the FDN
phonebook is activated, the sequences concerning call forwarding are allowed only if they are written in
the FDN. See Codes and Values Appendix for the list of supported sequences.
Command Possible responses
ATD*#21#
Note: Check any call forwarding status +CCFC: 0,7 Note: No call forwarding
ATD**61*[phone]**25#
Note: Register call forwarding on no reply, with no reply
timer fixed at 25 s.
OK
Note: done
ATD*2#
Note: Bad sequence +CME ERROR 3
Hang-Up Command H
Description: The ATH (or ATH0) command disconnects the remote user. In the case of multiple calls, all calls are
released (active, on-hold and waiting calls). The specific ATH1 command has been appended to
disconnect the current outgoing call, only in dialing or alerting state (i.e., ATH1 can be used only after
the ATD command, and before its terminal response (OK, NO CARRIER, ...)
It can be useful in the case of multiple calls.
Values: <n>
0 Ask for disconnection (default value)
1 Ask for outgoing call disconnection
Syntax: ATH<n>
Command Possible responses
ATH
Note: Ask for disconnection OK Note: Every call, if any, is released
ATH1
Note: Ask for outgoing call disconnection OK Note: Outgoing call, if any, is released