Sony Ericsson TT4031 (SE-GM29) - Manual (Page 20)

Owner’s Manual Rev 1.0 Page 20 of 20
2.4.5 Fax
The TT4031 (SE-GM29) allows fax transmissions to be sent and received by
commercial software installed on the application computer. Group 3 fax
Classes 1 and 2 are supported.
2.4.6 Supplementary Services
Call forwarding
Call hold, waiting and multiparty
Calling/called number identification
Advice of charge
USSD
Alternate line service
Customer service profile
Preferred networks
Operator selection
Network registration
Call barring
Call transfer
2.4.7 Serial Communication
The TT4031 (SE-GM29) enables an end-to-end communication path to be
established between the external telemetry/telematics application and a
remote terminal or host, via the GSM network. Once a path has been set
up, voice or data communication can take place. Serial data with flow
control according to the RS232 signalling protocol operates between the
modem and the external application.
Control of the TT4031 (SE-GM29) is by the external application, via the
RS232 serial interface, using a set of AT commands. The TT4031 (SE-
GM29) supports the full set of AT commands according to GSM 07.05 and
GSM 07.07. It also supports an extended set of Ericsson proprietary AT
commands to add extra functionality.
AT commands are used to operate the modem and have a broad range of
functions including:
configuring general parameters of the TT4031 (SE-GM29);