Fix. Play voicemail.

Copy from recordings.php

app/voicemails/resources/classes/voicemail.php

@@ -354,6 +354,7 @@
 					header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
 					header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // date in the past
 					header("Content-Length: " . filesize($file_path));
+					ob_end_clean();
 					fpassthru($fd);
 				}