1 files changed, 1 insertions, 0 deletions
diff --git a/zaptel.h b/zaptel.h
index 2748037..9e2350e 100755
--- a/zaptel.h
+++ b/zaptel.h
@@ -101,6 +101,7 @@
 #define	ZT_SIG_SF	 (1 << 14)			/* Single Freq. tone only, no sig bits */
 #define ZT_SIG_CAS	 (1 << 15)			/* Just get bits */
 #define ZT_SIG_DACS	((1 << 16) | ZT_SIG_CLEAR)	/* Cross connect */
+#define ZT_SIG_EM_E1	 (1 << 17)			/* E1 E&M Variation */
 
 /* tone flag values */
 #define	ZT_REVERSE_RXTONE 1  /* reverse polarity rx tone logic */