add 'role' to #sigtran_link{} indicating sg or asp role
diff --git a/include/osmo_ss7.hrl b/include/osmo_ss7.hrl
index 5dea6a3..587e9ec 100644
--- a/include/osmo_ss7.hrl
+++ b/include/osmo_ss7.hrl
@@ -11,7 +11,8 @@
 	linkset_name,
 	sls,
 	local,
-	remote
+	remote,
+	role
 }).