White Paper
J100
20
February 2006
Abbreviations
AMR
Adaptive Multi Rate.
Audio format for speech sounds.
API
Application Programming Interface.
DTMF or Touch Tone
Dual Tone Multi-Frequency signal – codes sent as
tone signals. Used for telephone banking, access-
ing an answering machine, etc.
e-GSM
Extended GSM. New frequencies specified by the
European Radio Communications Committee
(ERC) for GSM use when additional spectrum is
needed (Network-dependent). It allows operators
to transmit and receive just outside GSM’s core
900 frequency band. This extension gives
increased network capability.
ETSI
European Telecommunications Standards Institute.
GSM
Global System for Mobile Communications. The
GSM system family includes GSM 850, GSM 900,
GSM 1800 and GSM 1900. There are different
phases of roll-out for the GSM system and GSM
phones are either phase 1 or phase 2 compliant.
MT
Mobile Termination.
SIM-card
Subscriber Identity Module card – a card that must
be inserted in any GSM-based mobile phone. It
contains subscriber details, security information
and memory for a personal directory of numbers.
The card can be a small plug-in type or credit card-
sized, but both types have the same functions.
SMS
Short Messaging Service. Allows messages of up
to 160 characters to be sent and received via the
network operator’s message centre to a mobile
phone.
UI
User interface.
USSD
Unstructured Supplementary Services Data.
