User`s guide
Chapter 1 – AT Commands for Remote SIM Application Toolkit
Multi-Tech Systems, Inc. SIM Application Toolkit AT Commands (S000391C) 4
Chapter 1 – AT Commands for
Remote SIM Application Toolkit
This document presents the specification for AT commands and responses required for the SIM Application Toolkit
(SAT) implementation.
1.1 Introduction
SIM Application Toolkit (SAT) is a technology that lets the SIM card execute a great variety of additional applications.
Conventionally, SIM cards are intended to store user specific data, such as phonebooks, secure user identification
codes and messages, but they can also hold a lot of valueadded mobile applications.
The SAT functionality integrated in your GSM engine allows to execute network specific applications implemented on
the SIM card. Typical examples are online banking and information services.
The commands exchanged between SAT and the SIM application fall into two categories:
• Proactive commands – Sent from the SIM application to the module’s SAT; e.g., DISPLAY TEXT.
• Envelope commands – Sent from the module's SAT to the SIM application, e.g. MENU SELECTION.
The SAT implementation supports SAT class 3, GSM 11.14 Release 98, letter class “c”.
GSM 11.14 describes proactive and envelope commands in detail.
1.1.1 Other Documentation
See the applicable Quick Start Guide, User’s Guide, or Developer’s Guide supplied with your wireless product. These
manuals are located on the CD that accompanies your Developer Kit.
1.1.2 Terms and Abbreviations
Abreviation Description
CLUT Color Look-up Table
DTMF Dual Tone Multiple Frequency
ETSI European Telecommunications Standards Institute
GPRS General Packet Radio Service
GSM Global Standard of Mobile Communication
ME Mobile Equipment
MMI Man-Machine-Interface
MT Mobile Terminated
RFC Request for Comments
RFU Reserved for future use
RSAT Remote SAT
SIM Subscriber Identification Module
SMS Short Message Service
SS Supplementary Services
TA Terminal Application
UI User Interface
USSD Unstructured Supplementary Service Data