overlay/packages/services/Telephony/res/values/config.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2016 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<!-- Phone app resources that may need to be customized
     for different hardware or product builds. -->
<resources>
    <!-- Determine whether calls to mute the microphone in PhoneUtils
         are routed through the android.media.AudioManager class (true) or through
         the com.android.internal.telephony.Phone interface (false). -->
    <bool name="send_mic_mute_to_AudioManager">true</bool>
    <!-- Show enabled lte option for lte device -->
    <bool name="config_enabled_lte" translatable="false">true</bool>
    <!-- Allows the telephony HFA logic to run even if we're not in setup wizard. -->
    <bool name="config_allow_hfa_outside_of_setup_wizard">false</bool>
    <!-- Show Hearing aids option in  Call Settings -->
    <bool name="hac_enabled">true</bool>
    <!-- Allow handover from telephony calls to another ConnectionService. -->
    <bool name="config_support_handover_from">true</bool>
</resources>