diff --git a/shell/model/MeshModel.py b/shell/model/MeshModel.py
index b14d6f72..dd25d9f4 100644
--- a/shell/model/MeshModel.py
+++ b/shell/model/MeshModel.py
@@ -38,6 +38,8 @@ class ActivityModel:
     def get_color(self):
         return XoColor(self._activity.get_color())
 
+    def get_service_name(self):
+        return self._bundle.get_service_name()
 
 class MeshModel(gobject.GObject):
     __gsignals__ = {
diff --git a/shell/view/Shell.py b/shell/view/Shell.py
index 6d74f299..391657d5 100644
--- a/shell/view/Shell.py
+++ b/shell/view/Shell.py
@@ -114,19 +114,18 @@ class Shell(gobject.GObject):
         # we have a bundle on the system capable of handling
         # this activity type
         breg = self._model.get_bundle_registry()
-        bundle = breg.find_by_default_type(bundle_id)
+        bundle = breg.get_bundle(bundle_id)
         if not bundle:
             logging.error("Couldn't find activity for type %s" % bundle_id)
             return
 
-        act_type = bundle.get_service_name()
         home_model = self._model.get_home()
-        home_model.notify_activity_launch(activity_id, act_type)
+        home_model.notify_activity_launch(activity_id, bundle_id)
 
         handle = ActivityHandle(activity_id)
         handle.pservice_id = activity_id
 
-        handler = activityfactory.create(act_type, handle)
+        handler = activityfactory.create(bundle_id, handle)
         handler.connect('error', self._join_error_cb, home_model)
 
     def _start_error_cb(self, handler, err, home_model):
diff --git a/shell/view/home/MeshBox.py b/shell/view/home/MeshBox.py
index 40347f38..218a44d8 100644
--- a/shell/view/home/MeshBox.py
+++ b/shell/view/home/MeshBox.py
@@ -189,7 +189,7 @@ class ActivityView(SnowflakeBox):
         del self._icons[key]
 
     def _clicked_cb(self, item):
-        bundle_id = self._model.get_service().get_type()
+        bundle_id = self._model.get_service().get_service_name()
         self._shell.join_activity(bundle_id, self._model.get_id())
 
 class MeshBox(SpreadBox):
diff --git a/sugar/activity/activity.py b/sugar/activity/activity.py
index fe0780ca..53602536 100644
--- a/sugar/activity/activity.py
+++ b/sugar/activity/activity.py
@@ -85,10 +85,6 @@ class Activity(Window, gtk.Container):
         """Gets the activity service name."""
         return os.environ['SUGAR_BUNDLE_SERVICE_NAME']
 
-    def get_default_type(self):
-        """Gets the type of the default activity network service"""
-        return os.environ['SUGAR_BUNDLE_DEFAULT_TYPE']
-
     def get_shared(self):
         """Returns TRUE if the activity is shared on the mesh."""
         return self._shared
@@ -98,31 +94,16 @@ class Activity(Window, gtk.Container):
         return self._activity_id
 
     def _join(self, service):
+        """Join an existing instance of this activity on the network."""
         self._service = service
         self._shared = True
-
-        # Publish the default service, it's a copy of
-        # one of those we found on the network.
-        default_type = self.get_default_type()
-        services = activity_ps.get_services_of_type(default_type)
-        if len(services) > 0:
-            service = services[0]
-            addr = service.get_address()
-            port = service.get_port()
-            properties = service.get_published_values()
-            self._service = self._pservice.share_activity(
-                            self, default_type, properties, addr, port)
-        else:
-            logging.error('Cannot join the activity')
-
+        self._service.join()
         self.present()
 
     def share(self):
         """Share the activity on the network."""
         logging.debug('Share activity %s on the network.' % self.get_id())
-
-        default_type = self.get_default_type()
-        self._service = self._pservice.share_activity(self, default_type)
+        self._service = self._pservice.share_activity(self)
         self._shared = True
 
     def execute(self, command, args):
diff --git a/sugar/activity/activityfactoryservice.py b/sugar/activity/activityfactoryservice.py
index 08b5eec1..cf51f9ce 100644
--- a/sugar/activity/activityfactoryservice.py
+++ b/sugar/activity/activityfactoryservice.py
@@ -150,7 +150,6 @@ def run(bundle_path):
 
     os.environ['SUGAR_BUNDLE_PATH'] = bundle_path
     os.environ['SUGAR_BUNDLE_SERVICE_NAME'] = bundle.get_service_name()
-    os.environ['SUGAR_BUNDLE_DEFAULT_TYPE'] = bundle.get_default_type()
 
     factory = ActivityFactoryService(bundle.get_service_name(),
                                      bundle.get_class())
diff --git a/sugar/activity/bundle.py b/sugar/activity/bundle.py
index b8172e0d..98b9e9ae 100644
--- a/sugar/activity/bundle.py
+++ b/sugar/activity/bundle.py
@@ -146,13 +146,6 @@ class Bundle:
         """Get the path to the service object"""
         return '/' + self._service_name.replace('.', '/')
 
-    def get_default_type(self):
-        """Get the type of the main network service which tracks presence
-           and provides info about the activity, for example the title."""
-        splitted = self.get_service_name().split('.')
-        splitted.reverse()
-        return '_' + '_'.join(splitted) + '._udp'
-
     def get_icon(self):
         """Get the activity icon name"""
         return self._icon
diff --git a/sugar/activity/bundleregistry.py b/sugar/activity/bundleregistry.py
index 84696883..0cad4b25 100644
--- a/sugar/activity/bundleregistry.py
+++ b/sugar/activity/bundleregistry.py
@@ -93,13 +93,6 @@ class BundleRegistry(gobject.GObject):
         else:
             return None
 
-    def find_by_default_type(self, default_type):
-        """Find a bundle by the network service default type"""
-        for bundle in self._bundles.values():
-            if bundle.get_default_type() == default_type:
-                return bundle
-        return None
-
     def add_search_path(self, path):
         """Add a directory to the bundles search path"""
         self._search_path.append(path)