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Unstructured supplementary service data +cusd – Multi-Tech Systems MMCModem GPRS (MTMMC-G) User Manual

Page 90

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Chapter 10 – Supplementary Services Commands

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I)

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Unstructured Supplementary Service Data +CUSD

Description:

The USSD supplementary service is described in GSM 02.90. It is based on sequences of digits which
may be entered by a mobile user with a handset. A sequence entered is sent to the network which
replies with an alphanumerical string, for display only, or for display plus request for the next sequence.

This command is used to:

Enable or disable the CUSD indication sent to the application by the product when an incoming
USSD is received

Send and receive USSD strings

Values:


0
Disable the result code presentation
1 Enable the result code presentation
2 Cancel session (not applicable to read command response)

0 no further user action required (network initiated USSD-Notify, or no further information needed

after mobile initiated operation)

1 further user action required (network initiated USSD-Request, or further information needed after

mobile initiated operation)

2 USSD terminated by network
4 Operation not supported

is network string, converted in the selected character set
is the data coding scheme received (GSM TS 03.38).

Syntax: Command

syntax: AT+CUSD = [ , [ ] ]

Note: In case of enabled presentation, a +CUSD (as direct answer to a send

USSD) is then indicated with:

+CUSD: [,, ]

Command Syntax To Send and Receive USSD: AT+CUSD= [, [,]]

Note: Please be aware that the send USSD command needs the user to re-enter

the parameter!

Values for Send and Receive USSD

The USSD string to be sent.
The default alphabet and the UCS2 alphabet are supported.

When the product sends a USSD, an OK response is first returned, the
intermediate +CUSD indication comes subsequently. In case of error, a +CUSD:
4 indication is returned.

This manual is related to the following products: