Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 96 23.06.2010
+CUSD: (<n>s)
OK
AT+CUSD=?
Parameters
see Write Command
Response
+CUSD: <n>
OK
Read Command
AT+CUSD?
Parameters
see Write Command
Response
OK
+CME ERROR: <err>
Write Command
AT+CUSD=<n>[,
<str>[,<dcs>]]
Parameters
<n> a numeric parameter which indicates control of the unstructured
supplementary service data
0 disable the result code presentation in the TE
1 enable the result code presentation in the TE
2 cancel session (not applicable to read Command response)
<str> string type(string should be included in quotation marks)
USSD-string
<dcs> Cell Broadcast Data Coding Scheme in integer format (default 0)
Reference
GSM 03.38 [25]
Note
3.2.58 AT+CSSN Supplementary Services Notification
AT+CSSN Supplementary Services Notification
Response
+CSSN: (list of supported <n>s), (list of supported <m>s)
OK
Test Command
AT+CSSN=?
Parameters
see Write Command
Response
+CSSN: <n>,<m>
OK
Read Command
AT+CSSN?
Parameters
see Write Command