msc: fix osmo-stp.cfg for Iu tests

Change-Id: I102eb75f4b7ce46180fd45dd6548751e28a7f829
diff --git a/msc/osmo-stp.cfg b/msc/osmo-stp.cfg
index fd18907..101b525 100644
--- a/msc/osmo-stp.cfg
+++ b/msc/osmo-stp.cfg
@@ -42,9 +42,16 @@
  as virt-bsc1 m3ua
   asp virt-bsc1-0
   routing-key 1 0.24.2
+ asp virt-rnc0-0 23908 2905 m3ua
+  local-ip 127.0.0.1
+  remote-ip 127.0.0.1
+ as virt-rnc0 m3ua
+  asp virt-rnc0-0
+  routing-key 2 0.24.3
  route-table system
   update route 0.24.1 7.255.7 linkset virt-bsc0
   update route 0.24.2 7.255.7 linkset virt-bsc1
+  update route 0.24.3 7.255.7 linkset virt-rnc0
  listen m3ua 2905
   accept-asp-connections dynamic-permitted
  listen ipa 5000