Thanks guys. I don't know very much about MS Exchange other than it has to be installed on a server/domain controller, which I don't presently have, but if I read the Unified Messaging Instructions correctly, the system also works on an outgoing-only basis using SMTP. I'm sure it's something simple....(I finally got Outcalling to work properly after reading some other posts....turns out you must enter a "9" and several pauses in the numerical stream. Not properly explained in the documentation!)