diff --git a/openbsc/src/e1_input.c b/openbsc/src/e1_input.c
index 9b205b7..f7d69c5 100644
--- a/openbsc/src/e1_input.c
+++ b/openbsc/src/e1_input.c
@@ -303,6 +303,10 @@
 
 	switch (type) {
 	case E1INP_TS_TYPE_SIGN:
+		if (line->driver)
+			ts->sign.delay = line->driver->default_delay;
+		else
+			ts->sign.delay = 100000;
 		INIT_LLIST_HEAD(&ts->sign.sign_links);
 		break;
 	case E1INP_TS_TYPE_TRAU: