diff --git a/src/input/dahdi.c b/src/input/dahdi.c
index 9f1f2bb..ab06908 100644
--- a/src/input/dahdi.c
+++ b/src/input/dahdi.c
@@ -139,6 +139,7 @@
 		get_value_string(dahdi_evt_names, evt));
 
 	isd.line = ts->line;
+	isd.ts_nr = ts->num;
 
 	switch (evt) {
 	case DAHDI_EVENT_ALARM: