Sony Ericsson TT4031 (SE-GM29) - Manual (Page 271)

Owner’s Manual Rev 1.0 Page 271 of 271
Show supported
message types along
with the current service
setting
AT+CUSD?
•_ +CUSD:
•_ OK
•_ ERROR
Show list of supported
services
AT+CUSD=? •_ +CUSD: (list of
supported s)
•_ OK
•_ ERROR
This command allows control of the Unstructured Supplementary Service
Data (USSD) according to GSM 02.90. Both network and mobile initiated
operations are supported. Parameter is used to disable/enable the
presentation of an unsolicited result code (USSD response from the network,
or network initiated operation) +CUSD: [,,] to the TE. In
addition, value =2 is used to cancel an ongoing USSD session. If is
not given then the default value 0 is taken.
When is given, a mobile initiated USSD string or a response USSD
string to a network initiated operation is sent to the network. The response
USSD string from the network is returned in a subsequent unsolicited
+CUSD: result code.
The interaction of this command with other commands based on other GSM
supplementary services is described in the GSM standard.
Test command returns values supported by the TA as a compound value.
Some different scenarios are shown below:
An incoming network initiated USSD-Notify should be presented to
the external application as an unsolicited result code +CUSD: if the
external application has enabled result code presentation.
An incoming USSD-request asking for a reply should sent to the
external application as an unsolicited result code +CUSD: if the
external application has enabled result code.
If the external application answers to the request with the command
AT+CUSD then the ME sends the answer to the network.
A USSD-request sent with the command AT+CUSD from the external
application.
The different alternatives are shown below.
Network Mobile Equipment External application
1 Signal Sends unsolicited
result code +CUSD
Result code presentation
enabled, presented