diff --git a/openbsc/src/openbsc.cfg.1-1 b/openbsc/src/openbsc.cfg.1-1
index a25804f..542edd6 100644
--- a/openbsc/src/openbsc.cfg.1-1
+++ b/openbsc/src/openbsc.cfg.1-1
@@ -6,6 +6,8 @@
 line vty
  no login
 !
+e1_input
+ e1_line 0 driver misdn
 network
  network country code 1
  mobile network code 1
diff --git a/openbsc/src/openbsc.cfg.1-2 b/openbsc/src/openbsc.cfg.1-2
index 84d50c7..ebe6cc6 100644
--- a/openbsc/src/openbsc.cfg.1-2
+++ b/openbsc/src/openbsc.cfg.1-2
@@ -6,6 +6,8 @@
 line vty
  no login
 !
+e1_input
+ e1_line 0 driver misdn
 network
  network country code 1
  mobile network code 1
diff --git a/openbsc/src/openbsc.cfg.1-2-hopping b/openbsc/src/openbsc.cfg.1-2-hopping
index d26f779..654d397 100644
--- a/openbsc/src/openbsc.cfg.1-2-hopping
+++ b/openbsc/src/openbsc.cfg.1-2-hopping
@@ -6,6 +6,8 @@
 line vty
  no login
 !
+e1_input
+ e1_line 0 driver misdn
 network
  network country code 1
  mobile network code 1