Use tcp when contacting turn servers.

roles/configure-bbb/files/turn-stun-servers.xml.tmpl

@@ -48,14 +48,14 @@ This file was generated from a template. Modifications might be overwritten.
         <!-- Secret: -->
         <constructor-arg index="0" value="{{ static_auth_secret }}"/>
         <!-- TURN server URL, use turn: or turns: -->
-        <constructor-arg index="1" value="turns:{{ turn_server }}:443"/>
+        <constructor-arg index="1" value="turns:{{ turn_server }}:443?transport=tcp"/>
         <!-- TTL in seconds for shared secret -->
         <constructor-arg index="2" value="86400"/>
     </bean>
 
     <!--bean id="turn2" class="org.bigbluebutton.web.services.turn.TurnServer">
         <constructor-arg index="0" value="{{ static_auth_secret }}"/>
-        <constructor-arg index="1" value="turns:{{ turn_server }}:443"/>
+        <constructor-arg index="1" value="turns:{{ turn_server }}:443?transport=tcp"/>
         <constructor-arg index="2" value="86400"/>
     </bean-->