diff --git zaptel.h zaptel.h
index f196799..09d2764 100644
--- zaptel.h
+++ zaptel.h
@@ -295,6 +295,14 @@ typedef struct zt_dynamic_span {
 	int spanno;		/* Span number (filled in by zaptel) */
 } ZT_DYNAMIC_SPAN;
 
+struct zt_ec_data
+{
+	int channo; /* only matters for ioctl */
+	int N_d;
+	int a_i[256];
+	short a_s[256];
+};
+
 /* Define the max # of outgoing DTMF or MFv1 digits to queue in-kernel */
 #define ZT_MAX_DTMF_BUF 256
 
@@ -666,6 +674,9 @@ struct zt_versioninfo {
 #define ZT_STARTUP		_IOW (ZT_CODE, 99, int)
 #define ZT_SHUTDOWN		_IOW (ZT_CODE, 100, int)
 
+#define ZT_EC_DUMP		_IOR (ZT_CODE, 101, struct zt_ec_data)
+#define ZT_EC_PRELOAD		_IOW (ZT_CODE, 102, struct zt_ec_data)
+
 #define ZT_TONE_ZONE_MAX		128
 
 #define ZT_TONE_ZONE_DEFAULT 	-1	/* To restore default */