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Chapter 10 – Supplementary Services Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 81
Call Barring +CLCK
Description: This command allows control of the call barring supplementary service. Locking, unlocking or querying
the status of call barring is possible for all classes or for a specific class, but not for a combination of
some.
Values: <fac>
“AO”, “OI”, “OX” barring outgoing calls
“AI”, “IR” barring incoming calls
“AG”, “AC”, “AB barring all calls (<mode>=0 only)
<mode>
0 Unlocks the facility
1 Locks the facility
2 Query status
<class>
See description for the +CLCK command (Facility Lock) or +CCFC (Call forwarding).
Note: A combination of different classes is not supported. It will only result in the
activation/deactivation/status_request for all classes (7).
<status>
0 Not active
1 Active
Syntax: Command Syntax: AT+CLCK= <fac>, <mode> [, <password> [, <class> ] ]
Response Syntax: (for <mode>=2 and command successful)
+CLCK: <status> [, <class1> [ <CR><LF>+CLCK: <status>, <class2> [… ] ]
Command Possible responses
AT+CLCK=”AO”,1,1234
OK
Note: Command valid
AT+CLCK=”AO”,0,5555
+CME ERROR: 16
Note: Wrong password
AT+CLCK=”AO”,0,1234
OK
Note: Command valid
Modify SS Password +CPWD
Description: This command changes the supplementary service password.
Values: <fac> See +CLCK command with only “P2” facility added (SIM PIN2).
Note: Regardless of the specified facility, the change of password applies to barring all calls.
<OldPassword>, (NewPassword> The password code is over 8 digits for P2 facility (4 to 8 digits)
The password code is over 4 digits for other facilities (1 to 4 digits)
Syntax: Command Syntax: AT+CPWD=<fac>,<OldPassword>,<NewPassword>
Command Possible responses
AT+CPWD=”AO”,1234,5555
Note: Change Call Barring password
OK
Note: Password changed
AT+CPWD=”AO”,1234,5555
Note: Change password
+CME ERROR: 16
Note: Wrong password
AT+CPWD=”AO”,5555,1234
Note: Change password
OK
Note: Password changed