Siemens AC75 manual SIM related Commands, 14.1 AT+CRSM Restricted SIM Access, At+Crsm=?

AC75 AT Command Set

14. SIM related Commands

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14.SIM related Commands

The AT commands described in this chapter are related to the Subscriber Identity Module (SIM) connected to AC75.

Note:

If using data from the SIM please bear in mind that the content of all Elementary Files is subject to change at any moment!

This is because the network can change the SIM's data in the background via the SIM Application Toolkit (SAT) procedure "Data download to SIM". For a detailed description please refer to GSM 11.14, [25].

To get informed that changing Elementary Files has taken place the TA needs to hook to the SAT Proactive Com- mand "REFRESH". To achieve this, the AT command interface of SAT, i.e. Remote-SAT, needs to be activated. An overview is given at Chapter 16., SIM Application Toolkit (SAT) Commands, additional information is available with the document "Remote-SAT User Guide" [4].

14.1AT+CRSM Restricted SIM Access

AT+CRSM offers easy access of the Elementary Files on the SIM. Access to the SIM database is restricted to the commands which are listed at <command>. However, additional SIM commands are available via AT^SXSM. All parameters of AT+CRSM are used as specified by GSM 11.11 [24]. AC75 handles internally all required SIM interface locking and file selection routines.

As response to the command, the AC75 sends the actual SIM information parameters and response data. Error result code "+CME ERROR" may be returned if the command cannot be passed to the SIM, e.g. if the SIM is not inserted. However, failure in the execution of the command in the SIM is reported in <sw1> and <sw2> param- eters.

AT+CRSM requires PIN authentication. However, using <command> "READ BINARY" and <command> "READ RECORD" is possible before PIN authentication and if the SIM is blocked (state after three failed PIN authenti- cation attempts) to access the contents of the following Elementary Files:

EF Symbol	EF Name	EF ID (hex.)	EF ID (dec.)
EFICCID	ICC identification	2FE2	12258
EFELP	Extended language pref-	2F05	12037
	erence
EFLP	Language preference	6F05	28421
EFSPN	Service provider name	6F46	28486
EFAD	Administrative data	6FAD	28589
EFPhase	Phase identification	6FAE	28590
EFECC	Emergency call codes	6FB7	28599

Please beware of possible changes to Elementary Files by the network at any time, refer Chapter 14., SIM related Commands.

Syntax

Test Command

AT+CRSM=?

Response(s)

OK

AC75_ATC_V01.002	Page 402 of 569	10/30/06
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