The delivered event to the agent phone will have the distributing VDN if you are monitoring the VDN. See LucentV7CallInfo in the javadoc for more information on this private data that is available in a delivered (alerting) event. So basically if you have a listener on the VDN, then when a call comes to your application you can cast the CallCtlConnAlertingEv to LucentV7CallInfo to use getDistributingVDNAddress.