You can restrict certain digits that are the leading digits dialed when attempting to dial an international call. As far as I know, the USA is the only country that we need to dial 1 for calls here. All other countries, I believe, have a 2 digit number as their leading digits. You can set up a table to deny calls to any numbers you list and assign them to the lines & stations. Although, telprog has a very good idea too!! I would probably hook a printer to the SMDR port and pull reports to find out what line(s) is/are being used as well as the number being dialed, and from what extensions. I would then have a talk with the culprit!!!