diff --git a/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt b/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
index 66821cfe..f64d0731 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/BaresipService.kt
@@ -788,9 +788,9 @@ class BaresipService: Service() {
                     }
                     "call verified", "call secure" -> {
                         if (ev[0] == "call secure") {
-                            call!!.security = R.drawable.box_yellow
+                            call!!.security = R.drawable.locked_yellow
                         } else {
-                            call!!.security = R.drawable.box_green
+                            call!!.security = R.drawable.locked_green
                             call.zid = ev[1]
                         }
                         if (!isMainVisible)
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Call.kt b/app/src/main/kotlin/com/tutpro/baresip/Call.kt
index ec593561..7605e7d1 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Call.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Call.kt
@@ -83,7 +83,7 @@ class Call(val callp: Long, val ua: UserAgent, val peerUri: String, val dir: Str
     }
 
     init {
-        if (ua.account.mediaEnc != "") security = R.drawable.box_red
+        if (ua.account.mediaEnc != "") security = R.drawable.unlocked
     }
 
     fun destroy() {
diff --git a/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
index e2e3d526..965b2745 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/MainActivity.kt
@@ -303,7 +303,7 @@ class MainActivity : AppCompatActivity() {
                                 if (Api.cmd_exec("zrtp_unverify " + call.zid) != 0) {
                                     Log.e(TAG, "Command 'zrtp_unverify ${call.zid}' failed")
                                 } else {
-                                    securityButton.setImageResource(R.drawable.box_yellow)
+                                    securityButton.setImageResource(R.drawable.locked_yellow)
                                     securityButton.tag = "yellow"
                                 }
                             }
@@ -1039,9 +1039,9 @@ class MainActivity : AppCompatActivity() {
                     setPositiveButton(getString(R.string.yes)) { dialog, _ ->
                         val security: Int = if (Api.cmd_exec("zrtp_verify ${ev[3]}") != 0) {
                             Log.e(TAG, "Command 'zrtp_verify ${ev[3]}' failed")
-                            R.drawable.box_yellow
+                            R.drawable.locked_yellow
                         } else {
-                            R.drawable.box_green
+                            R.drawable.locked_green
                         }
                         call.security = security
                         call.zid = ev[3]
@@ -1056,10 +1056,10 @@ class MainActivity : AppCompatActivity() {
                         dialog.dismiss()
                     }
                     setNeutralButton(getString(R.string.no)) { dialog, _ ->
-                        call.security = R.drawable.box_yellow
+                        call.security = R.drawable.locked_yellow
                         call.zid = ev[3]
                         if (aor == aorSpinner.tag) {
-                            securityButton.setImageResource(R.drawable.box_yellow)
+                            securityButton.setImageResource(R.drawable.locked_yellow)
                             securityButton.tag = "yellow"
                             securityButton.visibility = if (Call.ofCallp(callp) == null)
                                 View.INVISIBLE
@@ -1078,7 +1078,7 @@ class MainActivity : AppCompatActivity() {
                     handleNextEvent("Call $callp that is verified is not found")
                     return
                 }
-                val tag: String = if (call.security == R.drawable.box_yellow)
+                val tag: String = if (call.security == R.drawable.locked_yellow)
                     "yellow"
                 else
                     "green"
@@ -1718,13 +1718,13 @@ class MainActivity : AppCompatActivity() {
 
     private fun setSecurityButtonTag(button: ImageButton, security: Int) {
         when (security) {
-            R.drawable.box_red -> {
+            R.drawable.unlocked -> {
                 button.tag = "red"
             }
-            R.drawable.box_yellow -> {
+            R.drawable.locked_yellow -> {
                 button.tag = "yellow"
             }
-            R.drawable.box_green -> {
+            R.drawable.locked_green -> {
                 button.tag = "green"
             }
         }
diff --git a/app/src/main/res/drawable/box_green.png b/app/src/main/res/drawable/box_green.png
deleted file mode 100644
index 16563e6f..00000000
Binary files a/app/src/main/res/drawable/box_green.png and /dev/null differ
diff --git a/app/src/main/res/drawable/box_red.png b/app/src/main/res/drawable/box_red.png
deleted file mode 100644
index dbbd1374..00000000
Binary files a/app/src/main/res/drawable/box_red.png and /dev/null differ
diff --git a/app/src/main/res/drawable/box_yellow.png b/app/src/main/res/drawable/box_yellow.png
deleted file mode 100644
index 4f1ae3ad..00000000
Binary files a/app/src/main/res/drawable/box_yellow.png and /dev/null differ
diff --git a/app/src/main/res/drawable/locked_green.xml b/app/src/main/res/drawable/locked_green.xml
new file mode 100644
index 00000000..68b62c01
--- /dev/null
+++ b/app/src/main/res/drawable/locked_green.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@color/colorGreen" android:pathData="M18,8h-1L17,6c0,-2.76 -2.24,-5 -5,-5S7,3.24 7,6v2L6,8c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2L20,10c0,-1.1 -0.9,-2 -2,-2zM12,17c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2zM15.1,8L8.9,8L8.9,6c0,-1.71 1.39,-3.1 3.1,-3.1 1.71,0 3.1,1.39 3.1,3.1v2z"/>
+</vector>
diff --git a/app/src/main/res/drawable/locked_yellow.xml b/app/src/main/res/drawable/locked_yellow.xml
new file mode 100644
index 00000000..07ceaf57
--- /dev/null
+++ b/app/src/main/res/drawable/locked_yellow.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@color/colorYellow" android:pathData="M18,8h-1L17,6c0,-2.76 -2.24,-5 -5,-5S7,3.24 7,6v2L6,8c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2L20,10c0,-1.1 -0.9,-2 -2,-2zM12,17c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2zM15.1,8L8.9,8L8.9,6c0,-1.71 1.39,-3.1 3.1,-3.1 1.71,0 3.1,1.39 3.1,3.1v2z"/>
+</vector>
diff --git a/app/src/main/res/drawable/unlocked.xml b/app/src/main/res/drawable/unlocked.xml
new file mode 100644
index 00000000..4812d509
--- /dev/null
+++ b/app/src/main/res/drawable/unlocked.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@color/colorRed" android:pathData="M12,17c1.1,0 2,-0.9 2,-2s-0.9,-2 -2,-2 -2,0.9 -2,2 0.9,2 2,2zM18,8h-1L17,6c0,-2.76 -2.24,-5 -5,-5S7,3.24 7,6h1.9c0,-1.71 1.39,-3.1 3.1,-3.1 1.71,0 3.1,1.39 3.1,3.1v2L6,8c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2L20,10c0,-1.1 -0.9,-2 -2,-2zM18,20L6,20L6,10h12v10z"/>
+</vector>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 0e664bc3..6ed4a683 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -104,6 +104,7 @@
                         android:layout_weight ="0"
                         android:layout_gravity="center_vertical"
                         android:visibility="invisible"
+                        android:background="#00000000"
                         android:contentDescription="@string/app_name" >
                     </ImageButton>
 
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 047a49af..6a400504 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -15,7 +15,8 @@
     <color name="colorBlack">#000000</color>
     <color name="colorStrong">@color/colorBlack</color>
     <color name="colorGreen">#01df01</color>
-    <color name="colorRed">#df0101</color>
+    <color name="colorRed">#ff0000</color>
+    <color name="colorYellow">#ffef00</color>
     <color name="colorLight">@color/colorWhite</color>
     <color name="colorDark">#383838</color>
     <color name="colorSpinnerText">@color/colorDark</color>