Specifications

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3GPPTS27.007ATCOMMANDS
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HSPA+ATCommandsReferenceGuide 66
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Syntax
Command Commandtype
AT+CHLD=[<n>] Execute
AT+CHLD=? Test
ParametersandValues
<n> 
0
Releasesallheldcalls,orsetstheUDUB(UserDeterminedUserBusy)indication
forawaitingcall.(onlyfromversionD).
1 Releasesallactivecallsifanyexist,andacceptstheother(heldorwaiting)call
1X ReleasesaspecificactivecallX.
2
Placesallactivecalls,ifanyexist,onholdan
dacceptstheother(heldorwaiting)
call.
2X
PlacesallactivecallsonholdexceptcallXwithwhichcommunicationis
supported(onlyfromversionD).
3 Addsheldcalltotheconversation.
4
Connectsthetwocallsanddisconnectsthesubscriberfrombothcalls(ExplicitCall
Transfer(E
CT))
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Note:"X"isthenumbering(startingwith1)ofthecallgivenbythesequenceof
settinguporreceivingthecalls(active,heldorwaiting)asseenbytheserved
subscriber.Callsholdtheirnumberuntiltheyarereleased.Newcallstakethe
lowestavailablenum
ber.
Note:Wherebothaheldandawaitingcallexist,theaboveproceduresapplyto
thewaitingcall—nottotheheldcall—inconflictingsituations.
Notes
 OnlyforVOICEcalls.
 Reference:3GPPTS27.007.
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.