Thanks for the comment Mike, I won't be able to try on site for a couple of days. I did try logging onto the conosole session (mstsc /v:server_name /console) via Remote Desktop and that didnt' make a difference. Since I have configured IVM to run as a service, I also tried calling the modem extension while logged off (hadn't tried that yet) and it didn't make a difference. After logging back on, I confirmed in the logs that the call was detected as above but left "unanswered".
I also tried to force the modem to pick up using AT commands which works, but circumvents the IVM software and the modem tries to initiate a data session so I am still working on this. I'll post back if I can get the wave driver working like I expect it to or find anything else out.
Thanks in advance for any help or comments,
Dave