diff --git a/xos/synchronizer/models/convenience/voltserviceinstance.py b/xos/synchronizer/models/convenience/voltserviceinstance.py
new file mode 100644
index 0000000..dc87b6c
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+++ b/xos/synchronizer/models/convenience/voltserviceinstance.py
@@ -0,0 +1,125 @@
+
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from xosapi.orm import ORMWrapper, register_convenience_wrapper
+from xosapi.convenience.serviceinstance import ORMWrapperServiceInstance
+
+from xosconfig import Config
+from multistructlog import create_logger
+
+log = create_logger(Config().get('logging'))
+
+class ORMWrapperVOLTServiceInstance(ORMWrapperServiceInstance):
+
+    @property
+    def vsg(self):
+        log.warning('VOLTServiceInstance.vsg is DEPRECATED, use get_westbound_service_instance_properties instead')
+        links = self.stub.ServiceInstanceLink.objects.filter(subscriber_service_instance_id = self.id)
+        for link in links:
+            # cast from ServiceInstance to VSGTenant
+            vsgs = self.stub.VSGServiceInstance.objects.filter(id = link.provider_service_instance.id)
+            if vsgs:
+                return vsgs[0]
+        return None
+
+    # DEPRECATED
+    @property
+    def vcpe(self):
+        log.warning('VOLTServiceInstance.vcpe is DEPRECATED, use VOLTServiceInstance.vsg instead')
+        return self.vsg
+
+    @property
+    def subscriber(self):
+        log.warning(
+            'VOLTServiceInstance.subscriber is DEPRECATED, use get_westbound_service_instance_properties instead')
+        # NOTE this assume that each VOLT has just 1 subscriber, is that right?
+        links = self.stub.ServiceInstanceLink.objects.filter(provider_service_instance_id = self.id)
+        for link in links:
+            subs = self.stub.CordSubscriberRoot.objects.filter(id=link.subscriber_service_instance_id)
+            if subs:
+                return subs[0]
+        return None
+
+    @property
+    def c_tag(self):
+        log.warning(
+            'VOLTServiceInstance.c_tag is DEPRECATED, use get_westbound_service_instance_properties instead')
+        return self.subscriber.c_tag
+
+    def get_olt_device_by_subscriber(self):
+        si = self.stub.ServiceInstance.objects.get(id=self.id)
+
+        olt_device_name = si.get_westbound_service_instance_properties("olt_device")
+
+        olt_device = self.stub.OLTDevice.objects.get(name=olt_device_name)
+        return olt_device
+
+    def get_olt_port_by_subscriber(self):
+        si = self.stub.ServiceInstance.objects.get(id=self.id)
+
+        olt_port_name = si.get_westbound_service_instance_properties("olt_port")
+
+        olt_device = self.get_olt_device_by_subscriber()
+        olt_port = self.stub.PONPort.objects.get(name=olt_port_name, olt_device_id=olt_device.id)
+        return olt_port
+
+    @property
+    def s_tag(self):
+        try:
+            olt_port = self.get_olt_port_by_subscriber()
+
+            if olt_port:
+                return olt_port.s_tag
+            return None
+        except Exception, e:
+            log.warning('Error while reading s_tag: %s' % e.message)
+            return None
+
+    @property
+    def switch_datapath_id(self):
+        try:
+            olt_device = self.get_olt_device_by_subscriber()
+            if olt_device:
+                return olt_device.switch_datapath_id
+            return None
+        except Exception, e:
+            log.warning('Error while reading switch_datapath_id: %s' % e.message)
+            return None
+
+    @property
+    def switch_port(self):
+        try:
+            olt_device = self.get_olt_device_by_subscriber()
+            if olt_device:
+                return olt_device.switch_port
+            return None
+        except Exception, e:
+            log.warning('Error while reading switch_port: %s' % e.message)
+            return None
+
+    @property
+    def outer_tpid(self):
+        try:
+            olt_device = self.get_olt_device_by_subscriber()
+            if olt_device:
+                return olt_device.outer_tpid
+            return None
+        except Exception, e:
+            log.warning('Error while reading outer_tpid: %s' % e.message)
+            return None
+
+
+register_convenience_wrapper("VOLTServiceInstance", ORMWrapperVOLTServiceInstance)