diff --git a/xos/synchronizer/models/convenience/voltservice.py b/xos/synchronizer/models/convenience/voltservice.py
new file mode 100644
index 0000000..032aabd
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+++ b/xos/synchronizer/models/convenience/voltservice.py
@@ -0,0 +1,52 @@
+
+# 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.service import ORMWrapperService
+
+import logging as log
+
+class ORMWrapperVOLTService(ORMWrapperService):
+
+    def get_onu_sn_from_openflow(self, dp_id, port_no):
+        """Return the ONU serial number from logical_device informations
+        
+        example usage:
+            volt = VOLTService.objects.first()
+            sn = volt.get_onu_from_openflow("of:0000000ce2314000", 2)
+            # BRCM1234
+
+        Arguments:
+            dp_id {string} -- The openflow id of the OLT device
+            port_no {int} -- The openflow port id (UNI Port)
+        
+        Returns:
+            string -- ONU Serial Number
+        """
+
+        log.debug("Searching ONUDevice for %s:%s", (dp_id, port_no))
+        print "Searching ONUDevice for %s:%s", (dp_id, port_no)
+        try:
+            olt = self.stub.OLTDevice.objects.get(dp_id=dp_id)
+            uni_ports = self.stub.UNIPort.objects.filter(port_no=port_no)
+            onu = [o.onu_device for o in uni_ports if o.onu_device.pon_port.olt_device.id == olt.id][0]
+            return onu.serial_number
+        except IndexError:
+            log.error("Can't find ONU for %s:%s", (dp_id, port_no))
+        except Exception:
+            log.exception("Error while finding ONUDevice for %s:%s", (dp_id, port_no))
+
+register_convenience_wrapper("VOLTService", ORMWrapperVOLTService)
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