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3GPPTS27.007ATCOMMANDS

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ATCommandsforHSPA‐H5Modem 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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))

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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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.

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