diff --git a/openbsc/src/libabis/e1_input.c b/openbsc/src/libabis/e1_input.c
index 97dcd33..293175e 100644
--- a/openbsc/src/libabis/e1_input.c
+++ b/openbsc/src/libabis/e1_input.c
@@ -570,6 +570,7 @@
 	if (!link)
 		return -EINVAL;
 
+	isd.line = ts->line;
 	isd.link_type = link->type;
 	isd.trx = link->trx;
 	isd.tei = tei;