diff --git a/openbsc/src/input/dahdi.c b/openbsc/src/input/dahdi.c
index 6b70791..c142b8a 100644
--- a/openbsc/src/input/dahdi.c
+++ b/openbsc/src/input/dahdi.c
@@ -210,6 +210,7 @@
 		return 0;
 	}
 
+	DEBUGP(DMI, "TX: %s\n", hexdump(msg->data, msg->len));
 	lapd_transmit(e1i_ts->driver.dahdi.lapd, sign_link->tei,
 		      sign_link->sapi, msg->data, msg->len);
 	msgb_free(msg);