notification/drawable-anydpi-v21/ic_phone_in_talk_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M20,15.5c-1.25,0 -2.45,-0.2 -3.57,-0.57 -0.35,-0.11 -0.74,-0.03 -1.02,0.24l-2.2,2.2c-2.83,-1.44 -5.15,-3.75 -6.59,-6.59l2.2,-2.21c0.28,-0.26 0.36,-0.65 0.25,-1C8.7,6.45 8.5,5.25 8.5,4c0,-0.55 -0.45,-1 -1,-1L4,3c-0.55,0 -1,0.45 -1,1 0,9.39 7.61,17 17,17 0.55,0 1,-0.45 1,-1v-3.5c0,-0.55 -0.45,-1 -1,-1zM19,12h2c0,-4.97 -4.03,-9 -9,-9v2c3.87,0 7,3.13 7,7zM15,12h2c0,-2.76 -2.24,-5 -5,-5v2c1.66,0 3,1.34 3,3z"/>
</vector>