Specifications

3GPPTS27.007ATCOMMANDS
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67 ATCommandsforHSPA‐H5Modems
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UnstructuredSupplementaryServiceData+CUSD
SetcommandallowscontroloftheUnstructuredSupplementaryServiceData(USSD[GSM02.90]).
Readcommandreportsthecurrentvalueoftheparameter<n>.
Testcommandreportsthesupportedvaluesfortheparameter<n>.
Syntax
Command Commandtype
AT+CUSD=[<n>[,<str>[,<dcs>]]] Set
AT+CUSD? Read
AT+CUSD=? Test
ParametersandValues
<n> Disablesorenablethepresentationofanunsolicitedresultcode.
0 DisabletheresultcodepresentationintheDTA.
1 EnabletheresultcodepresentationintheDTA.
2 CancelanongoingUSSDsession.Notapplicabletoreadcommandresponse.
<str> USSD‐string.When<str>parameterisnotgiven,network
isnotinterrogated.
 If<dcs>indicatesthatGSM338defaultalphabetisusedME/TA
convertsGSMalphabetintocurrentTEcharacterset.See+CSCS.
 If<dcs>indicatesthat8‐bitdatacodingschemeisused:ME/TA
convertseach8‐bitoctetintotwoIRAcharacterlonghexadecimal
number;forexampleoctetwithintegervalue42ispresentedto
TEastwocharacters2A(IRA50and65).
<dcs> GSM3.38CellBroadcastDataCodingSchemeinintegerformat.Default:0.
Note:Theunsolicitedresultcodeenabledbyparameter<n>isintheformat:
+CUSD:<m>[,<str>,<dcs>]totheTE
where:
<m>:
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thenetwork
3‐otherlocalclienthasresponded
4‐operationnotsupported
5‐networktimeout
Notes
 Onlymobileinitiated operations aresupported. 
 Reference:3GPPTS27.007.