Add sound prompt

docs/phrase/phrase_en.xml

@@ -426,6 +426,7 @@
 	  <prompt phrase="Barracuda Networks" filename="ivr-barracuda_networks.wav"/>
 	  <prompt phrase="CudaTel Communication Server" filename="ivr-cudatel_communication_server.wav"/>
 	  <prompt phrase="Please enter the first few letters of the person's first or last name" filename="dir-enter_person_first_or_last.wav"/>
+	  <prompt phrase="There are no calls waiting in this queue." filename="ivr-no_calls_waiting_in_queue.wav"/>
 	  <prompt phrase="Brian West" filename="misc-Brian_West.wav"/>
 	  <prompt phrase="Anthony Minessale" filename="misc-Anthony_Minessale.wav"/>
 	  <prompt phrase="Michael Jerris" filename="misc-Michael_Jerris.wav"/>