-#define SS5_FEATURE_MUTE 0x00000100 /* mute audio path while 2600/2400 Hz tones are detected */
-#define SS5_FEATURE_QUALITY 0x00000200 /* indicate quality of received digits */
+#define SS5_FEATURE_MUTE_RX 0x00000100 /* mute audio path when 2600/2400 Hz tones are detected */
+#define SS5_FEATURE_MUTE_TX 0x00000200 /* mute audio path when 2600/2400 Hz tones are detected and reply tones are transmitted */
+#define SS5_FEATURE_QUALITY 0x00000400 /* indicate quality of received digits */