add virt-nitb: a fully virtual network with 2 MS

Change-Id: I31cf24006ea9ceb83622aedef22046c53db90142
diff --git a/virt-nitb/call.sh b/virt-nitb/call.sh
new file mode 100755
index 0000000..e21dd7b
--- /dev/null
+++ b/virt-nitb/call.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+osmo_interact_vty.py -H 127.0.0.1 -p 4247 -c "enable;call 1 2"
+sleep 5
+osmo_interact_vty.py -H 127.0.0.2 -p 4247 -c "enable;call 2 answer"