- added support detecting (mwi) and listening of voicemails

- activated via account's voicemail uri

app/src/main/res/layout/activity_account.xml

@@ -157,6 +157,26 @@
             android:popupBackground="@drawable/spinner_background" >
         </Spinner>
 
+        <TextView
+            android:id="@+id/VoicemailUriTitle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:paddingTop="10dp"
+            android:textSize="18sp"
+            android:textColor="@android:color/black"
+            android:onClick="onClick"
+            android:text="Voicemail URI" >
+        </TextView>
+
+        <EditText
+            android:id="@+id/voicemailUri"
+            android:layout_height="wrap_content"
+            android:hint="SIP URI"
+            android:textSize="18sp"
+            android:inputType="textUri"
+            android:layout_width="fill_parent">
+        </EditText>
+
     </LinearLayout>
 
 </ScrollView>

app/src/main/res/layout/activity_main.xml

@@ -149,6 +149,18 @@
 
     </ScrollView>
 
+    <ImageButton
+        android:id="@+id/voicemailButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:background="@null"
+        android:src="@drawable/voicemail"
+        android:layout_toStartOf="@id/contactsButton"
+        android:layout_marginEnd="10dp"
+        android:layout_alignParentBottom="true"
+        android:visibility="invisible" >
+    </ImageButton>
+
     <ImageButton
         android:id="@+id/contactsButton"
         android:layout_width="wrap_content"