Multi-Tech Systems CDMA Wireless Modem manual Messages Exchanged During a SIM ToolKit Operation

Chapter 15 – SIM TOOLKIT

Data Download to SIM

Data downloading to the SIM allows data (SMS, phonebook) or programs (Java applets) received by SMS or by Cell Broadcast to be transferred directly to the SIM Application.

This feature does not need any AT command. It is transparent to the customer application.

Menu Selection

A set of menu items is supplied by the SIM Application ToolKit. The menu selection command can then be used to inform the SIM Application which menu item is selected.

The commands used for this operation are: +STIN (SIM Toolkit Indication) +STGI (SIM Toolkit Get Information) +STGR (SIM Toolkit Give Response)

Call control by SIM

The call control mechanism allows the SIM to check all dialed numbers, supplementary service control strings and USSD strings before connecting to the network. This gives the SIM the ability to allow, bar or modify the string before the operation starts.

The commands used for this operation are: +STCR (SIM Toolkit Control Response) +STGR (SIM Toolkit Give Response)

Messages Exchanged During a SIM ToolKit Operation

The following scheme shows the SIM Toolkit commands and unsolicited results that are exchanged.

+STSF=X,XXXXXXXX

STEP 1: Configuration and Activation

+STIN=X

STEP 2: SIM sends pro-active command

MULTI-TECH

Modem

+STGI=X

Customer

Application

+STGI response

STEP 3: Customer application gets all the information.

+STCR:X

+STGR=X,XXXXXX

STEP 4: User response is sent to the SIM.

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 112