diff -r 27393e484974 -r 49eb84b80b96 server/session.py
--- a/server/session.py	Tue Apr 02 15:11:21 2013 +0200
+++ b/server/session.py	Tue Apr 02 15:11:41 2013 +0200
@@ -808,7 +808,8 @@
     # server-side service call #################################################
 
     def call_service(self, regid, async=False, **kwargs):
-        return self.repo.call_service(self.id, regid, async, **kwargs)
+        return self.repo._call_service_with_session(self, regid, async,
+                                                    **kwargs)
 
 
     # request interface #######################################################