Thank you for your help. We did do some detective work today and we confirmed that the person we suspected was listening to our conversations has "Service Observing" programed on his station. To test it -all we did from his station was select intercom, #, 0, 3 and the extension number of the station of which had an active call and it worked. His jig is up....he won't be hearing anymore of our phone conversations. Thanks again!