Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 528)

Supplementary Services Commands
Unstructured Supplementary Service Data +CUSD
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
20.7 Unstructured Supplementary Service Data +CUSD
20.7.1 Description
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
Note:
The USSD supplementary service is described in GSM 02.90 [24].
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.
20.7.2 Syntax
• to enable disable
Action command
AT+CUSD=[,[]]
OK
Read command
AT+CUSD?
+CUSD:
OK
Test command
AT+CUSD=?
+CUSD: (list of supporteds)
OK
Unsolicited response
+CUSD: [,[,]]