castiron-
Thanks for pitching in to help. The Lucent Win Modem is on the recommended list:
http://www.nch.com.au/kb/10063.html
I've done some more testing and have some info.
In one case, it looks like an incoming call may have interfered, but other times it seems to have just stopped cold.
However, what I am now seeing (or finally noticing) is that IVM taskbar icon pops up a little note about "Lucent Win Modem: Unknown".
Tonight it ran for one hour and 40 minutes before hitting the error.
It's as though IVM has a temporary failure to communicate with the modem and then is unable to reacquire it. Pause/Start OGM does not work or help. However, stopping IVM completely and then restarting IVM returns everything to normal (until the next time).
1) Is there a reason/bug/setting why IVM loses the modem and can't detect it again?
2) Is this a known problem that is fixed in update/patch?
3) Is there a trick to force it to re-detect the modem without restarting IVM?
Note: my next step will be to check for updated modem drivers and to remove/add the modem back into IVM. I may also try a modem test button after the next failure (but before restarted IVM).
Is there any known issue on IVM "forgetting" it's modem (and patch/upgrade that fixes)?
Thanks