The following lists the AT control commands that a device is expected to support. However, a device may support more commands than listed. For example, some modems support both AT+CGMI and AT+GMI to retrieve the manufacturer name, while only AT+CGMI is required.
In the future, additional commands from the GSM specifications 3GPP TS 27.005 and 3GPP TS 27.007 may be required, so it is recommended that all device manufacturers fully comply with these 3GPP specifications.
General commands (3GPP TS 27.007, section 5)
Command
Description
AT+CGMI
Request manufacturer information
AT+CGMM
Request model identification
AT+CGMR
Request revision identification
AT+CGSN
Request product serial number identification (of the device, not SIM card)
AT+CSCS
Select TE character set
AT+CIMI
Request international mobile subscriber identity
AT+CMUX
Multiplexing mode
Call control commands (3GPP TS 27.007, section 6)
Command
Description
ATDnnn;
Dial "nnn" in voice mode
ATDnnn
Dial "nnn" in data mode
ATH
Hangup the current call
ATA
Answer an incoming call
AT+CBST
Select bearer service type
AT+CRC
Cellular result codes
RING, +CRING
Unsolicited result codes for incoming ring notifications
NO CARRIER, NO ANSWER, NO DIALTONE, BUSY
Unsolicited result codes that indicate call termination
Note: When the ATD command is used with a trailing ';', it is highly recommended that it immediately return to command mode after command processing. Some modems have been known to wait until the receiving party answers the call, or busy is detected, before returning to command mode. Such modems are not compliant with the 3GPP specification but can still be supported by overriding QModemCallProvider::atdBehavior() in the modem vendor plug-in.
The 3GPP TS specification permits ATD to be used in a special mode for dialing directly from phone books. This mode is not required as Qt Extended implements its own algorithm for converting phone book entries to numbers.
It is important that ATD recognize numbers starting with + as international, and all other numbers as being local.
Network service related commands (3GPP TS 27.007, section 7)
Command
Description
AT+CNUM
Subscriber number
AT+CREG
Network registration
+CREG
Unsolicited result code for network registration events
AT+COPS
Operator (PLMN) selection
AT+CLCK
Facility lock
AT+CPWD
Change password
AT+CLIP
Calling line identification presentation
+CLIP
Unsolicited result code for caller identification presentation
AT+CLIR
Calling line identification restriction
AT+COLP
Connected line identification presentation
+COLP
Unsolicited result code for connected line identification presentation
AT+CCFC
Call forwarding number and conditions
AT+CCWA
Call waiting
+CCWA
Unsolicited result code for call waiting
AT+CHLD
Call related supplementary services
AT+CTFR
Call deflection
AT+CUSD
Unstructured supplementary service data
+CUSB
Unsolicited result code for unstructured supplementary service events
AT+CAOC
Advice of charge
+CCCM
Unsolicited result code for advice of charge indications
AT+CSSN
Supplementary service notifications
+CSSI
Unsolicited result code for mobile-originated call setup supplementary services
+CSSU
Unsolicited result code for mobile-terminated call setup supplementary services
AT+CLCC
List current calls
AT+CPOL
Preferred PLMN list
AT+CPLS
Selection of preferred PLMN list
AT+COPN
Read operator names
Mobile termination control and status commands (3GPP TS 27.007, section 8)
Command
Description
AT+CFUN
Set phone functionality
AT+CPIN
Enter PIN
AT+CBC
Battery charge
+CBC
Unsolicited result code for battery charge notifications
AT+CSQ
Signal quality
+CSQ
Unsolicited result code for signal quality notifications
AT+CIND
Indicator control
+CIEV
Unsolicited result code for indicator control events
AT+CMER
Mobile termination event reporting
AT+CPBS
Select phone book memory storage
AT+CPBR
Read phone book entries
AT+CPBW
Write phone book entry
AT+CSIM
Generic SIM access
AT+CRSM
Restricted SIM access
AT+CVIB
Vibrator mode
AT+CACM
Accumulated call meter
AT+CAMM
Accumulated call meter maximum
AT+CPUC
Price per unit and currency table
AT+CCWE
Call meter maximum event
+CCWV
Unsolicited result code for call meter maximum events
AT+CSVM
Set voice mail number
AT+CTZR
Time zone reporting
+CTZV
Unsolicited result code for time zone change events
The phone book commands are intended for accessing phone books stored on SIM cards, typically the SM phone book. Qt Extended provides its own mechanisms for managing phone books stored within the phone memory.
Mobile termination errors (3GPP TS 27.007, section 9)
Command
Description
AT+CMEE
Report mobile termination error
Commands for packet domain, GPRS (3GPP TS 27.007, section 10)
Command
Description
AT+CGDCONT
Define PDP context
AT+CGATT
PS attach or detach
AT+CGREG
GPRS network registration status
+CGREG
Unsolicited result code for GPRS network registration status
AT+CGSMS
Select service for MO SMS messages
ATD*99*...
Request packet domain service
SMS commands (3GPP TS 27.005)
Command
Description
AT+CPMS
Preferred message storage
AT+CMGF
Message format (we use format 0: PDU)
AT+CSCA
Service centre address
AT+CSCB
Select cell broadcast message types
AT+CNMI
New message indications to TE
AT+CMGL
List messages
AT+CMGR
Read message
AT+CMGS
Send message
AT+CMGD
Delete message
AT+CMMS
More messages to send
+CMTI
Notification of SMS message delivery
+CMT
Notification of a directly delievered SMS message
+CDSI
Notification of an SMS status report message
+CBM
Notification of a directly delivered cell broadcast message
It is assumed that incoming SMS messages are stored in a temporary storage area on the device and that Qt Extended will retrieve the messages using the AT+CMGL and AT+CMGR commands.
Multiplexing commands (3GPP TS 07.10)
Qt Extended expects to use 3GPP TS 07.10 multiplexing to establish multiple communications paths with the modem. The modem needs to support the AT+CMUX command plus the basic packet mode in 3GPP TS 07.10. If the modem supports some other form of multiplexing, then it is necessary to implement a multiplexer plug-in.
Other commands (3GPP TS 27.007, Appendix C)
Command
Description
AT+FCLASS
Select mode
AT+VGR
Receive gain selection
AT+VGT
Transmit gain selection
AT+VTS
DTMF and tone generation
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