User`s guide
Chapter 1 – AT Commands for Remote SIM Application Toolkit
Multi-Tech Systems, Inc. SIM Application Toolkit AT Commands (S000391C) 17
1.3 ^SSTN Remote-SAT Notification
Proactive
Commands
Every time the SIM application issues a proactive command via the ME, the TA will
receive a notification. This indicates the type of proactive command issued.
AT^SSTGI must be used by the TA to request the parameters of the proactive
command from the ME.
After receiving the ^SSTGI response from the ME, the TA must send AT^SSTR to
confirm the execution of the proactive command and provide any required user
response; e.g., selected menu item.
Unsolicited result code
^SSTN: <cmdType>
Parameters
<cmdType> Proactive command ID. See Table 1.
Note: Only one proactive command can be ongoing at a time.
Terminate
Proactive
Command
When the SIM application has issued a proactive command via the ME to the TA, it is
possible that this command must be terminated. The ^SSTN Unsolicited Result Code is
sent but with a different command type (add terminate offset 100) to indicate the
termination of the specified command.
The state changes to IDLE.
The TA should then avoid sending any further commands related to the terminated
proactive command; e.g., AT^SSTGI or AT^SSTR.
Unsolicited result code
^SSTN: <cmdTerminateValue>
Parameters
<cmdTerminateValue> is defined as <cmdType> + terminate offset. The terminate
offset equals 100.
Terminate proactive command ID. See Table 1.
SIM
Application
Returns to
Main Menu
Notification to the TA when the SIM Application has finished a command cycle and
enters its main menu again, which was transferred with an URC ^SSTN: 37
(SET UP MENU) at start up.
This URC should be used to open this menu on the screen.
The TA does not need to respond directly; i.e., AT^SSTR is not required.
Unsolicited result code
^SSTN: <254>
SIM
Removed/
Reset
Notification to the TA if the SIM has been removed or if the proactive command
REFRESH – SIM Reset has been issued by the SIM Application. See section 1.4.2.
This URC should be used to set the TAs application to its initial state. The SIM
application will be started from the beginning if a SIM is available. A response; e.g.,
AT^SSTGI or AT^SSTR, from the TA is neither required nor allowed.
If the ME is still engaged to access the SIM interface, the response might be “+CME
ERROR: SIM blocked” or “+CME ERROR: SIM busy” followed by AT commands
requiring the PIN.
The TA should retry to access the SIM interface until the ME responds “OK”.
Please note that this process, depending on the SIM, may take more than 10 seconds.
Unsolicited result code
^SSTN: 255
Reference
Note:
To limit the time the Remote-SAT is kept in the states PAC or WAIT, any ongoing (but
unanswered) proactive command will automatically be aborted after 10 minutes. In this
case, the terminal response is either “ME currently unable to process command”, or, if
applicable, “No response from user”. The URC “Terminate Proactive Command” will be
sent to the external application, too.