Specifications


3GPPTS27.007ATCOMMANDS

ATCommandsforHSPA‐H5Modem 66

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and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(ECT))

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number.
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.
CallDeflection+CTFR
Setcommandrequestsaservicethatcausesanincomingalertingcalltobeforwardedtoaspecifiednumber.This
isbasedontheGSM/UMTSsupplementaryserviceCD(CallDeflection.Referto3GPPTS22.072.
Testcommandtestsforcommandexistence.
Syntax
Command Commandtype
AT+CTFR=<number>[,<type>] Set
AT+CTFR=? Test
ParametersandValues
<number> Stringtype,phonenumberofformatspecifiedby<type>.
<type>
Typeofaddressoctetinintegerformat.Defaultis145whendialingstring
includesinternationalaccesscodecharacter"+",otherwise129.
Note:CallDeflectionisonlyapplicabletoanincomingvoicecall.