Westermo GD-01 US User manual

GSM
Modem
www.westermo.com
©Westermo Teleindustri AB • 2005
AT-Commands
Interface Guide
6196-2220
GD-01
GD-01 TCP/GD-01 US

26196-2220
Contents
Short form list of AT commands .................................................................................................... 3–8
List of AT-commands ................................................................................................................................ 9–175
General commands .................................................................................................................................... 10–17
Call Control commands ....................................................................................................................... 18–25
Network service commands .......................................................................................................... 26–33
Security commands ................................................................................................................................... 34–40
Phonebook commands .......................................................................................................................... 41–52
Short Messages commands ............................................................................................................. 53–74
Supplementary Services commands .................................................................................. 75–92
Data commands .......................................................................................................................................... 93–103
Fax commands .......................................................................................................................................... 104–114
V24-V25 commands ........................................................................................................................... 115–125
Specific AT commands ................................................................................................................... 126–146
AT commands for GPRS .............................................................................................................. 148–175
Data / Commands multiplexering protocoll ..................................................... 176–178
Error codes from modem .......................................................................................................... 179–184
GSM 04.11 Annex E-2: Mobile originating SM-transfer ...................... 185–188
Power down mode via RS-232 .............................................................................................. 189–190
GSM sequences list .............................................................................................................................. 191–192
Application example ........................................................................................................................ 193–200
GSM network operators, subscriptions and services .......................................... 201
Antenna installation information ................................................................................................... 202
Glossary ............................................................................................................................................................................ 203
Trouble shooting/FAQ ................................................................................................................................... 204
Related documents ............................................................................................................................................ 205

36196-2220
Command Description Direct +CSAS &W &F Default
Save value
+CGMI Manufacturer identification – – – – –
+CGMM Request model identification – – – – –
+CGMR Request revision identification – – – – –
+CGSN Product Serial Number – – – – –
+CSCS Select TE character set – – x x “PPCP437”
+WPCS Phonebook Character Set – – x x “TRANSPARENT”
+CIMI Request IMSI – – – – –
+CCID Card Identification – – – – –
+GCAP Capabilities list – – – – –
+CPOF Power off – – – – –
+CFUN Set phone functionality – – – – –
+CPAS Phone activity status – – – – –
+CMEE Report Mobile Equipment errors – – x x 0
+CKPD Keypad control – – – – –
+CCLK Clock Management – – – – –
+CALA Alarm Management – – – – –
Short form list of AT commands
S-registers Description Direct +CSAS &W &F Default
Save value
S0 Ring signals before auto answer - - x x 0
General commands
Command Description Direct +CSAS &W &F Default
Save value
D Dial command - – – – –
H Hang–Up command – – – – –
A Answer a call – – – – –
+CEER Extended error report – – – – –
+VTD DTMF signals tone duration – – – – –
+VTS Send DTMF signals – – – – –
%Dn Automatic dialing with DTR – – x x 0
+CICB Incoming Call Bearer – – x x 2
+CSNS Single Numbering Scheme – – x x 0
Call control commands
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Command Description Direct +CSAS &W &F Default
Save value
+CSQ Signal Quality – – – – –
+COPS Operator selection x – x x 0,2
+CREG Network registration – – x x 0
+WOPN Read operator name – – – – –
+CPOL Preferred operator list – – – – –
Network service commands
Command Description Direct +CSAS &W &F Default
Save value
+CPIN Enter PIN – – – – –
+CPIN2 Enter PIN2 – – – – –
+CPINC PIN remaining attempt number – – – – –
+CLCK Facility lock – – – – –
+CPWD Change password – – – – –
Security commands
Command Description Direct +CSAS &W &F Default
Save value
+CPBS Select phonebook memory storage - - - - -
+CPBR Read phonebook entries - - - - -
+CPBF Find phonebook entries - - - - -
+CPBW Write phonebook entry - - - - -
+CPBP Phonebook phone search - - - - -
+CPBN Move action in phonebook - - - - -
+CNUM Subscriber number - - - - -
+WAIP Avoid phonebook init - - x x 0
+WDCP Delete Calls Phonebook - - - - -
+CSVM Set Voice Mail Number x - - x 0
Phonebook commands
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Command Description Direct +CSAS &W &F Default
Save value
+CSMS Select message service x – – – 0
+CNMA New Message Acknowledgement – – – – –
+CPMS Preferred Message Storage – – – – –
+CMGF Preferred Message Format – – x x 1
+CSAS Save Settings – – – – –
+CRES Restore settings – – – – –
+CSDH Show text mode parameters – – x x 0
+CNMI New message indication – x – x 0,1,0,0,0
+CMGR Read message – – – – –
+CMGL List message – – – – –
+CMGS Send message – – – – –
+CMGW Write Message to Memory – – – – –
+CMSS Send Message From Storage +CMSS – – – – –
+CSMP Set Text Mode Parameters – x – x 1,167,0,0
+CMGD Delete message – – – – –
+CSCA Service center address – x – – SIM dependant
+CSCB Select Cell Broadcast Message Types – – – – –
+WCBM Cell Broadcast Message Identifiers – – – – –
+WMSC Message status modification – – – – –
+WMGO Message overwriting – – – – –
+WUSS Unchange SMS Status – x – x 0
Short Messages commands
Command Description Direct +CSAS &W &F Default
Save value
+CCFC Call forwarding – – – – –
+CLCK Call barring – – – – –
+CPWD Modify SS password – – – – –
+CCWA Call waiting – – x x 0
+CLIR Calling line identification restriction – – – – –
+CLIP Calling line identification presentation – – x x 0
+COLP Connected line identification presentation – – x x 0
+CAOC Advice of charge – – – – –
+CACM Accumulated call meter – – – – –
+CAMM Accumulated call meter maximum – – – – –
+CPUC Price per unit and currency table – – – – –
+CHLD Call related supplementary services – – – – –
+CLCC List current calls – – – – –
+CSSN Supplementary service notifications – – x x 0,0
+CUSD Unstructured supplementary service data x – – x 0
+CCUG Closed user group x – – – 0,0,0
Supplementary Services commands
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66196-2220
Command Description Direct +CSAS &W &F Default
Save value
+CBST Bearer type selection – – x x 0,0,1
+FCLASS Select mode – – – – –
+CR Service reporting control – – x x 0
+CRC Cellular result codes – – x x 0
+ILRR DTE–DCE local rate reporting – – x x 0
+CRLP Radio link protocol parameters – – x x 61,61,48,6,1
+DOPT Others radio link parameters – – x x 1,1
%C Select data compression – – x x 2
+DS V42 bis data compression – – x x 3,0,4096,20
+DR V42 bis data compression report – – x x 0
\N Select data error correcting mode – – x x 0
Data commands
Command Description Direct +CSAS &W &F Default
Save value
+FTM Transmit speed – – – – –
+FRM Receive speed – – – – –
+FTH HDLC transmit speed – – – – –
+FRH HDLC receive speed – – – – –
+FTS Stop transmission and wait – – – – –
+FRS Receive silence – – – – –
Fax class 1 commands
Command Description Direct +CSAS &W &F Default
Save value
+FDT Transmit Data – – – – –
+FDR Receive Data – – – – –
+FET Transmit page punctuation – – – – –
+FPTS Page transfer status parameters – – – – –
+FK Terminate Session – – – – –
+FBOR Page transfer bit order – – x x 0
+FBUF Buffer size report – – – – –
+FCQ Copy quality checking – – x x 0
+FCR Capability to receive – – x x 1
+FDIS Current sessions parameters – – x x 0,5,0,0,2,0,0,0,0
+FDCC DCE capabilities parameters – – x x 0,5,0,0,2,0,0,0,0
+FLID Local ID string – – – – –
+FPHCTO Page transfer timeout parameter – – x x 30
Fax class 2 commands
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Command Description Direct +CSAS &W &F Default
Save value
+IPR Fixed DTE rate – – x – 9600
+ICF DTE–DCE character framing – – x – 3,4
+IFC DTE–DCE local flow control – – x – 2,2
&C Set DCD signal – – x – 1
&D Set DTR signal – – x – 1
&S Set DSR signal – – x – 1
O Back to online mode – – – – –
Q Result code suppression – – x x 0
V DCE response format – – x x 1
Z Default configuration – – – – –
&W Save configuration – – – – –
&T Auto–tests – – – – –
E Echo – – x – 1
&F Restore factory settings – – – – –
&V Display configuration – – – – –
I Request identification information – – – – –
+WMUX Data / Commands Multiplexing – – x x 0
V24-V25 commands
Command Description Direct +CSAS &W &F Default
Save value
+CCED Cell environment description – – – – –
+CCED Automatic RxLev indication – – – – –
+WIND General Indications x – – x 0
+WLPR Read Language Preference – – – – –
+WLPW Write Language Preference – – – – –
+WAC Abort command – – – – –
+WDWL Downloading – – – – –
+WDR Data Rate x – – – 2
+WHWV Hardware Version – – – – –
+WDOP Date of Production – – – – –
+WSTR Status Request – – – – –
+WSCAN Scan – – – – –
+WRIM Ring Indicator Mode – – – – –
+W32K 32kHz Power down Mode – – – – –
+WSSW Internal Software version – – – – –
+WCCS Custom Character Set – – – – –
+WLCK Lock – – – – –
+CPHS CPHS command x – – x 0
+WMIR Customer storage mirror – – – – –
+WMBN CPHS Mail Box Number – – – – –
+WRST Reset – – – – –
+WATH Hang–up – – – – –
Specific AT commands
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Command Description Direct +CSAS &W &F Default
Save value
+CGDCONT Define PDP Context – – – – –
+CGQREQ Requested Quality of Service Profile – – – – –
+CGQMIN (Minimum acceptable)
Quality of Service Profile – – – – –
+CGATT GPRS attach or detach – – – – –
+CGACT PDP context activate or deactivate – – – – –
+CGDATA Enter data state – – – – –
+CGCLASS GPRS mobile station class – – – – –
+CGSMS Select service for MO SMS messages – – – – –
+CGEREP GPRS event reporting – – – – –
+CGREG GPRS network registration status – – – – –
D Request GPRS IP service – – – – –
+CGAUTO Automatic response to a network
request for PDP context activation – – – – –
+CGANS Manual response to a network
request for PDP context activation – – – – –
+CGPADDR Show PDP address – – – – –
+CGCOUNTERS PDP Counters Infos – – – – –
+WGPRS GPRS PARAMETERS CUSTOM: – – – – –
+WGAUTH Set authentication parameters – – – – –
+WGIPCPINF Get IPCP informations – – – – –
AT commands for GPRS
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List of AT-commands
Commands always start with AT (which means ATtention) and finish with a <CR>
character.
Information responses and result codes
Responses normally start and end with <CR><LF>, except when the modem is set to
“short result code format” with the command ATV0, or when the ATQ1 (no result
codes) command is used.
If command syntax is incorrect, an ERROR string is returned. If extended error
result codes are configured (+CMEE) and if command syntax is correct but with some
incorrect parameters, the +CME ERROR: <Err> or +CMS ERROR: <SmsErr> strings
are returned with different error codes. If the command line has been performed suc-
cessfully, 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.
In the AT-command list below, <CR> and <CR><LF> are intentionally omitted.
Special AT-commands
In addition to the commands listed below there are two special commands that do not
start with AT.The first command is “A/” without any <CR>.This command makes the
modem repeat the last entered command.The second special command is the “+++”
(also without <CR>).This command is called “escape sequence” and is used when the
modem is in dedicated mode (online mode).When entering “+++” in dedicated mode,
the modem will switch from “online mode” to “online command mode”.This means that
it is possible to send commands to the local modem.The escape sequence is useful when
disconnecting the active call.The disconnection is made with the ATH command (see the
list of AT-commands below).The ATO command can also be used when in “online com-
mand mode”.

10 6196-2220
General commands
+CGMI – Manufacturer identification
Description:
This command gives the GSM engine manufacturer identification.
Syntax:
AT+CGMI
Command example Possible responses Note
AT+CGMI WAVECOM MODEM Module manufacturer
OK
+CGMM – Request model identification
Description:
This command is used to get the supported frequency bands.With multi-band products
the response may be a combination of different bands.
Syntax:
AT+CGMM
Command example Possible responses Note
AT+CGMM MULTIBAND 900E 1800 Support of 900
OK and 1800 MHz
+CGMR – Request revision identification
Description:
This command is used to get the GSM engine software version.
Syntax:
AT+CGMR
Command example Possible responses Note
AT+CGMR 430a09gm.2D ... Software release 4.30
OK

116196-2220
+CGSN – Product Serial Number
Description:
This command allows the user application to get the IMEI
(International Mobile Equipment Identifier) of the product.
Syntax:
AT+CGSN
Command example Possible responses Note
AT+CGSN 135790248939 IMEI read from EEPROM
OK
AT+CGSN +CME ERROR: 22 IMEI not found
in EEPROM
+CSCS – Select TE character set
Description:
This command informs the ME which character set is used by the TE.The ME 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.
Syntax:
AT+CSCS=<Character Set>
<Character Set> may be one of the following parameters
“GSM” GSM default alphabet.
“PCCP437” PC character set code page 437.
“CUSTOM” User defined character set (see also. +WCCS command).
“HEX” Hexadecimal mode. No character set used; the user can
read or write hexadecimal values.
Command example Possible responses Note
AT+CSCS=”GSM” OK Command valid
AT+CSCS=”PCCP437” OK Command valid
AT+CSCS=? +CSCS: ("GSM"... Possible values
OK

12 6196-2220
+WPCS – Phonebook Character Set
Description:
This specific command informs the ME which character set is used by the TE for the
phonebooks.The ME 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.
Syntax:
AT+WPCS=<Character Set>
<Character Set> may be one of the following parameters
“TRANSPARENT” Transparent mode.The strings are displayed and entered
as they are stored in SIM or in ME.
“CUSTOM” User defined character set
(see also. +WCCS command).
“HEX” Hexadecimal mode. No character set used ; the user can
read or write hexadecimal values.
Command example Possible responses Note
AT+WPCS=”TRANSPARENT” OK Command valid
AT+WPCS=”CUSTOM” OK Command valid
AT+WPCS=? +WPCS: ("TRANSP... Possible values
OK
+CIMI – Request IMSI
Description:
This command is used to read and identify the IMSI (International Mobile Station
Identity) of the SIM card.The PIN may need to be entered before reading the IMSI.
Syntax:
AT+CIMI
Command example Possible responses Note
AT+CIMI 208200120320598 IMSI value (15 digits)

136196-2220
+CCID – Card Identification
Description:
This command orders the product to read the EF-CCID file on the SIM card. 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.
Syntax:
AT+CCID
Command example Possible responses Note
AT+CCID +CCID:“123456789... EF-CCID is present,
hexadecimal format
AT+CCID? +CCID:“123456789... Same result as +CCID
AT+CCID=? OK No parameter but this
command is valid
+GCAP – Capabilities list
Description:
This command gets the complete list of capabilities.
Syntax:
AT+GCAP
Command example Possible responses Note
AT+GCAP +GCAP: +CGSM +FCLASS Supports GSM and FAX
OK commands
+CPOF – Power down modem software
Description:
This specific command stops the GSM software stack as well as the hardware layer.
The AT+CFUN=0 command is equivalent to +CPOF.
Syntax:
AT+CPOF
Command example Possible responses Note
AT+CPOF OK Command valid

14 6196-2220
+CFUN – Set phone functionality
Description:
This command 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 be 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 writ-
ten (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.
Syntax:
AT+CFUN=<functionality level>
<functionality level> may be one of the following parameters
0 Execute an IMSI detach
1 Restart the whole GSM registration process.
Command example Possible responses Note
AT+CFUN? +CFUN: 1 Full functionality indicated
OK Command valid
AT+CFUN=0 OK Detach from network.
AT+CFUN=1 OK Set the full functionality
mode with a complete
software reset

156196-2220
+CPAS – Phone activity status
Description:
This command returns the activity status of the mobile equipment.
Syntax:
AT+CPAS
Command example Possible responses Note
AT+CPAS +CPAS: <pas> Current activity status OK
Defined values:
<pas> may be one of the following parameters
0 ready (allow commands from TA/TE)
1 unavailable (does not allow commands)
2 unknown
3 ringing (ringer is active)
4 call in progress
5 asleep (low functionality)
+CMEE – Report Mobile Equipment Errors
Description:
This command disables or enables the use of the “+CME ERROR: <xxx>” or “+CMS
ERROR:<xxx>” result code instead of simply “ERROR”.
See chapter ”error codes” for ”+CME ERROR” result codes description and ”+CMS
ERROR” result codes.
Syntax:
AT+CMEE=<error reporting flag>
<error reporting flag> may be one of the following parameters
0 Disable ME error reports, use only ”ERROR”
1 Enable long error reports, ”+CME ERROR xxx”
or ”+CMS ERROR xxx”
Command example Possible responses Note
AT+CMEE=0 OK Disable ME error reports,
use only «
ERROR »
AT+CMEE=1 OK Enable
”+CME ERROR: <xxx>”
or
”+CMS ERROR: <xxx>”

16 6196-2220
+CKPD – Keypad control
Description:
This command emulates the ME keypad by sending each keystroke as a character
in a <keys> string.The supported GSM sequences are listed below in this manual.
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.
Syntax:
AT+CKPD=<keys>
<keys> may be a string of the following characters
0-9,*,# characters allowed in the keypad control string
Command example Possible responses Note
AT+CKPD=”*#21#” +CCFC: 0,7 Check every call
forwarding status
AT+CKPD=”1234” +CME ERROR 3 Sequence not allowed
+CCLK – Clock Management
Description:
This command is used to set or get the current date and time of the ME real-time clock.
Default date/time is “98/01/01,00:00:00” (January 1st, 1998 / midnight).
Syntax:
AT+CCLK=<date and time string>
<date and time string> is a string with the following format:
“yy/MM/dd,hh:mm:ss” Valid years are 98 (for 1998) to 97 (for 2097).
The seconds field is not mandatory.
Command example Possible responses Note
AT+CCLK=”00/06/09,17:33:00” OK set date to June 9th, 2000,
and time to 5:33pm
AT+CCLK=”00/13/13,12:00:00” +CME ERROR 3 Incorrect month entered
AT+CCLK? +CCLK:“00/06/09... current date is June 9th,
2000, time is also reported

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+CALA – Alarm Management
Description:
This command is used to set alarms date/time in the ME.
The maximum number of alarms is 16. Seconds are not taken into account.
Syntax:
AT+CALA=<date and time string> (set alarm)
AT+CALA=””,<index> (delete alarm)
<date and time string> is a string with the following format:
“yy/MM/dd,hh:mm:ss” Valid years are 98 (for 1998) to 97 (for 2097).
The seconds field is not mandatory.
<index> is a number from 0 to 15.
Command example Possible responses Note
AT+CALA=
”00/06/09,07:30” OK Set an alarm for June 9th,
2000 at 7:30 am,
alarm stored
AT+CALA=
”99/03/05,13:00:00” +CME ERROR 3 Invalid alarm
(date/time expired)
AT+CALA? +CALA: list all alarms Note: three
“00/06/08,15:25:00”,0 alarms are set
+CALA:
“00/06/09,07:30:00”,1 (index 0, 1, 2)
+CALA:
“00/06/10,23:59:00”,2
+CALA: An alarm occurs (index 0)
“00/06/08,15:25:00”,0
AT+CALA=””,2 OK Delete alarm index 2
Note: Alarm index 2
deleted
AT+CALA? +CALA:
“00/06/09,07:30:00”,1 List all alarms,
only one alarm (index 1)

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Call Control commands
D and DL – Dial command
The ATD command is used to data or fax call.As per GSM 02.30, the dial command also
controls supplementary services.
For a data or a fax 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.
For a voice call, the application sends the following ASCII string to the product: (the bear-
er may be selected previously, if not a default bearer is used).A voice call must be used
when sending DTMF tones.
ATD<nb>; where <nb> is the destination phone number.
Please note that 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 data call to the Westermo Sweden office from another country, the
AT command is:“ATD+4616428000”
Note that some countries may have specific numbering rules for their GSM handset
numbering.
The ATDL command dials the last valid dialled number.
The response to the ATD command is one of the following:
Verbose result code Numeric code Description
with ATV0 set
OK 0 if the call succeeds, for
voice call only
CONNECT <speed> 10,11,12, 13,14,15 <speed> if the call succeeds, for
data calls only 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

196196-2220
Direct dialling from a phonebook (stored in the SIM card)
Direct dialling can be performed with the following command:
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> (mem is “SM”,“LD”,“MC”,“ME”,“RC”,“MT” or “SN”,
see +CPBS command) allows direct dialling from a phonebook number.
Does not function with "ON" mem..15
Syntax:
ATD<nb>[<I>][;]
ATD>[<mem>]<index>[<I>][;]
ATD>[<mem>]<name>[<I>][;]
<nb> is the number to dial.
Command example Possible responses Note
AT+CPBS? +CPBS:”SM”,8,10 ADN phonebook is
selected, 8 locations are
used and 10 locations are
available
ATD>SM6; OK Call index 6 from
AND phonebook and
call succeeds
Command specific information
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.

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GSM sequences
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 activat-
ed, the sequences concerning call forwarding are allowed only if there are written in the
FDN.
Example of using GSM sequences:
Command example Possible responses Note
ATD*#21# +CCFC: 0,7 Check any call forwarding
status, no call forwarding
reported
ATD**61*[phone]**25# OK Register call forwarding
on no reply, with no reply
timer fixed at 25 s, result:
done.
ATD*2# +CME ERROR 3 Bad sequence
See the enf of the manual for the list of supported sequences.
H – Hang-Up command
Description:
The ATH (or ATH0) command is used by the application to disconnect the remote user.
In the case of multiple calls, all calls are released (active, on-hold and waiting calls).
The ATH1 command disconnects the current outgoing call, only in dialing or alerting
state (ie. 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.
Syntax:
ATH
Command example Possible responses Note
ATH OK Ask for disconnection,
result: every call, if any, are
released
ATH1 OK Ask for outgoing call
disconnection,
Result: Outgoing call,
if any, is released