1 files changed, 3 insertions, 0 deletions
diff --git a/zaptel.h b/zaptel.h
index f1a1fa7..b3d5483 100755
--- a/zaptel.h
+++ b/zaptel.h
@@ -771,6 +771,9 @@ struct zt_tone_def {		/* Structure for zone programming */
 /* Timer event -- ping ready */
 #define ZT_EVENT_TIMER_PING		16
 
+/* Polarity reversal event */
+#define ZT_EVENT_POLARITY  17
+
 #define ZT_EVENT_PULSEDIGIT (1 << 16)	/* This is OR'd with the digit received */
 #define ZT_EVENT_DTMFDIGIT  (1 << 17)	/* Ditto for DTMF */