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Chapter 14 – SIM-Related Commands

Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 195

14.2 AT^SXSM Extended SIM Access

Description: AT^SXSM extends AT+CRSM with additional SIM commands.

All parameters of AT^SXSM are used as specified by GSM 11.11. The Multi-Tech wireless

modem handles internally all required SIM interface locking and file selection routines.

The Multi-Tech wireless modem may return error result code “+CME ERROR” if the

command cannot be passed to the SIM; e.g., if no SIM is inserted. However, errors related

to SIM action are reported in <sw1> and <sw2> parameters as defined in GSM 11.11.

Test Command Syntax: AT^SXSM=?

Response: OK

Write Command Syntax: AT^SXSM=<command>[, <fileID>[, <P1>, <P2>, <P3>[, <data>]]]

Response: ^SXSM: <sw1>, <sw2>[,<response>]

ERROR

+CME ERROR: <err>

Parameter Descriptions:

136 RUN GSM ALGORITHM

Start the authentication mechanism and cipher key generation on the SIM. It runs the

algorithms A3 and A8 using a 16 byte random number and the subscriber authentication

key Ki, which is stored in the SIM.

Identifier for an elementary data file on SIM, if used by <command>.

Parameters to be passed on by the Multi-Tech wireless modem to the SIM.

<data>

If <command>=136 (RUN GSM ALGORITHM):

16 byte random number.

Status information from the SIM about the execution of the actual command. It is returned in both cases, on

successful or failed execution of the command.

0...255

Response in case of a successful completion of the previously issued SIM command.

If <command>=136 (RUN GSM ALGORITHM):

The Multi-Tech wireless modem returns SRES and cipher key Kc as calculated by the SIM.

Byte(s) Description Length

1 - 4 SRES - Signed RESponse 4

5 - 12 Kc - Cipher Key 8

Example:

Use <command>=136 (RUN GSM ALGORITHM) to obtain SRES and cipher key Kc values as calculated by the SIM.

at^sxsm=136,,0,0,16,”0011223 Start SIM command “RUN GSM ALGORITHM” with 16 byte random

number.

3445566778899AABBCCDDEEFF”

^SXSM: SRES (bytes 1-4) and Cypher Key Kc (bytes 5-12) values as returned by

the SIM.

144,0,00112233445566778899AA

1 2 ... 190 191 192 193 194 195 196 197 198 199 200 ... 252 253

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Multitech MTCBA-C-IP-N1 Especificaciones Pagina 195