[Samsung Galaxy Alpha] gggg:
I put it into system/csc/Features.xml and changed rw-r-r but still cant find any option under call settings .... I took a look in my TAB S (4.4.2), which has the option, but the feature.xml there also does not include the line you suggested ... any idea ?

SM-A500fu (4.4.4)

<?xml version="1.0" encoding="UTF-8" ?>
<!-- It can be added for each operators like below form
<ABC> -> sales code
<sapient>true</sapient> -> feature1
<burton>false</burton> -> feature2
<libtech>true</libtech> -> feature3
.
.
</ABC>

each name of tags are will be environment variable with "ro.csc."
ex) "ro.csc.sapient", "ro.csc.burton", "ro.csc.libtech" <== you could use them at any section.
also, should be added between <FeatureSet>
and </FeatureSet> .
jhwan.kim@hdlnc.com
by Wanam -->
<SamsungMobileFeature>

<Country></Country>
<CountryISO></CountryISO>
<SalesCode></SalesCode>

<!-- KOR -->
<FeatureSet>
<CscFeature_VoiceCall_ConfigRecording>RecordingAllowed</CscFeature_VoiceCall_ConfigRecording>
<CscFeature_Contact_DisableMessageLog>FALSE</CscFeature_Contact_DisableMessageLog>
<CscFeature_Contact_ConfigDefaultViewBy>AllCalls</CscFeature_Contact_ConfigDefaultViewBy>
<CscFeature_Contact_EnableCallButtonInList>FALSE</CscFeature_Contact_EnableCallButtonInList>
<CscFeature_Contact_DisableAccountIconsInContactList>FALSE</CscFeature_Contact_DisableAccountIconsInContactList>
<CscFeature_Email_UseFixedBgColorAsWhite>TRUE</CscFeature_Email_UseFixedBgColorAsWhite>
<CscFeature_Email_BackgroundColorWhite>TRUE</CscFeature_Email_BackgroundColorWhite>
<CscFeature_Message_SmsInputMode>automatic</CscFeature_Message_SmsInputMode>
<CscFeature_RIL_ForceConnectMMS>FALSE</CscFeature_RIL_ForceConnectMMS>
<CscFeature_Message_DisableSmsToMmsConversionByTextInput>FALSE</CscFeature_Message_DisableSmsToMmsConversionByTextInput>
<CscFeature_Message_DisableConvertingEffectBetweenSMSMMS>FALSE</CscFeature_Message_DisableConvertingEffectBetweenSMSMMS>
<CscFeature_Message_SmsMaxByte>140</CscFeature_Message_SmsMaxByte>
<CscFeature_Message_RecipientLimit>10</CscFeature_Message_RecipientLimit>
<CscFeature_Message_SmsToMmsTextThreshold>10</CscFeature_Message_SmsToMmsTextThreshold>
<CscFeature_Launcher_DisablePageRotation>FALSE</CscFeature_Launcher_DisablePageRotation>
<CscFeature_Web_AddOptionToTerminate>FALSE</CscFeature_Web_AddOptionToTerminate>
<CscFeature_Web_EnableDesktopSiteAsDefault>FALSE</CscFeature_Web_EnableDesktopSiteAsDefault>
<CscFeature_Wifi_MaxClient4MobileAp>4</CscFeature_Wifi_MaxClient4MobileAp>
<CscFeature_Sip_UseSymbolInCMKey>FALSE</CscFeature_Sip_UseSymbolInCMKey>
<CscFeature_Sip_EnableSymbolInSecondary></CscFeature_Sip_EnableSymbolInSecondary>
<CscFeature_Gallery_AddAutoRotationIcon>FALSE</CscFeature_Gallery_AddAutoRotationIcon>
<CscFeature_Contact_SetLinkCountMaxAs>5</CscFeature_Contact_SetLinkCountMaxAs>
<CscFeature_Contact_UseSeparateAddressField>FALSE</CscFeature_Contact_UseSeparateAddressField>
<CscFeature_Common_DisablePhoneNumberFormatting>FALSE</CscFeature_Common_DisablePhoneNumberFormatting>
<CscFeature_Camera_EnableCameraDuringCall>FALSE</CscFeature_Camera_EnableCameraDuringCall>
<CscFeature_Camera_CamcoderForceShutterSoundDuringSnapShot>FALSE</CscFeature_Camera_CamcoderForceShutterSoundDuringSnapShot>
<CscFeature_Camera_ShutterSoundMenu>TRUE</CscFeature_Camera_ShutterSoundMenu>
<CscFeature_RIL_EnableLaunchBrowser>TRUE</CscFeature_RIL_EnableLaunchBrowser>
<CscFeature_Sip_ApplyAutoCorrectionPatent>true</CscFeature_Sip_ApplyAutoCorrectionPatent>
<CscFeature_Web_EnableAutoSimHomeUrlInProfile>TRUE</CscFeature_Web_EnableAutoSimHomeUrlInProfile>
<CscFeature_Setting_SupportWifiCall>TRUE</CscFeature_Setting_SupportWifiCall>
</FeatureSet>
</SamsungMobileFeature>

my Tab S (SM-t705, 4.4.2) does not have the following lines, the rest is ident.:

<CscFeature_RIL_EnableLaunchBrowser>TRUE</CscFeature_RIL_EnableLaunchBrowser>
<CscFeature_Sip_ApplyAutoCorrectionPatent>true</CscFeature_Sip_ApplyAutoCorrectionPatent>
<CscFeature_Web_EnableAutoSimHomeUrlInProfile>TRUE</CscFeature_Web_EnableAutoSimHomeUrlInProfile>
<CscFeature_Setting_SupportWifiCall>TRUE</CscFeature_Setting_SupportWifiCall>