overlay-operators/packages/apps/Phone/res/values/config.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- 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>

    <!-- Flag indicating if the tty is enabled -->
    <bool name="tty_enabled">true</bool>

    <!-- Flag indicating if dtmf tone type is enabled -->
    <bool name="dtmf_type_enabled">true</bool>

    <!-- Determine whether we should show the "listen for instructions" screen after
         successfully placing the OTA call -->
    <integer name="OtaShowListeningScreen">1</integer>

    <!-- If this is true, the SIM card (through Customer Service Profile EF file) will be
         able to prevent manual operator selection. If false, this SIM setting will be
         ignored and manual operator selection will always be available. See
         CPHS4_2.WW6, CPHS B.4.7.1 for more information -->
    <bool name="csp_enabled">true</bool>
</resources>