diff --git a/src/include/switch_utils.h b/src/include/switch_utils.h
index 9802730137..81c00b78a8 100644
--- a/src/include/switch_utils.h
+++ b/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