mtp: Send a simple ISUP message
diff --git a/contrib/TestSender.st b/contrib/TestSender.st
index fa3a2c6..4913416 100644
--- a/contrib/TestSender.st
+++ b/contrib/TestSender.st
@@ -24,6 +24,12 @@
     datagram data: msg.
     socket nextPut: datagram.
 
+    "ISUP"
+    msg := #(2 0 0 1 0 0 0 0 0 0 0 11
+             197 232 197 7 224 3 0 23 1 1 28) asByteArray.
+    datagram data: msg.
+    socket nextPut: datagram.
+
     "TRA"
     msg := #(2 0 0 1 0 0 0 0 0 0 0 6 192 232 197 7 0 23) asByteArray.
     datagram data: msg.