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White Paper T630/T628
45 October 2003
For Mobile Originated SMS, an SMS message is
sent from a Mobile Station to the SMS-C where it is
forwarded to its destination. This can be another
Mobile Station, or a terminal in the fixed network.
A Mobile Terminated SMS is when an SMS mes-
sage is forwarded from the SMS-C to a Mobile Sta-
tion. When the Mobile Station receives the
message, it returns a delivery report saying the
transfer was successful.
Fixed dialling and Restricted calls
For a company or an organization, it can be useful
to restrict phone calls. Fixed Dialling allows the
user to preset a number of digits, for example area
codes. This restricts the user to making calls only
to numbers which use the preset digits as leading
digits. Fixed Dialling makes use of the PIN2, and it
requires fixed dial fields on the SIM card.
The Restrict Calls service allows the user to block
outgoing or incoming calls in certain situations, for
example international calls.
SIM application toolkit
The SIM Application Toolkit (SIM AT) is a smart
card-centric method of deploying programs that
apply only to GSM and to SMS and USSD trans-
ports. Programs must be distributed on smart
cards. For an operator, a company or service pro-
vider, SIM AT offers a powerful way to deploy pro-
grams and services to users, without the need for
new or upgraded equipment. All necessary setup
and programming is distributed to users over the
air, directly to their phones. In the T630/T628, a
separate menu is available for functions residing on
the SIM card. These can include submenus for
controlling functions, and also functions which
allow the phone to initiate calls, send data, and dis-
play information to the user.