add w and W

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4157 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_utils.h

@@ -122,7 +122,7 @@ SWITCH_DECLARE(unsigned char) switch_char_to_rfc2833(char key);
   \param key the key to test
   \return TRUE or FALSE
  */
-#define is_dtmf(key)  ((key > 47 && key < 58) || (key > 64 && key < 69) || (key > 96 && key < 101) || key == 35 || key == 42)
+#define is_dtmf(key)  ((key > 47 && key < 58) || (key > 64 && key < 69) || (key > 96 && key < 101) || key == 35 || key == 42 || key == 87 || key = 119)
 
 /*!
   \brief Duplicate a string