Noobie here, so this may be a really dumb and simple question, but I can't seem to resolve it so far.

I want to simply test if the phone line is in use before I have my program dial the modem (VB6). I'm trying using MSComm but even the .portopen command returns an error. Shouldn't I be able to set portopen = true then output AT commands to test for use? Is there an easier way to silently be sure no one is talking on the phone line before the modem dials?

I'm probably missing the obvious, please go easy on me .

Thanks