Sony Ericsson TT4031 (SE-GM29) USSD, Call barring, Call transfer, Call forwarding, Advice of charge, Preferred networks, Operator selection, Network registration, Alternate line service

2.4.5Fax

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.

2.4.6Supplementary Services

Call forwardingCall hold, waiting and multipartyCalling/called number identificationAdvice of chargeUSSDAlternate line serviceCustomer service profilePreferred networksOperator selectionNetwork registrationCall barringCall transfer

2.4.7Serial 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);

Owner’s Manual Rev 1.0 Page 20 of 20