We use the Blackice Fax Toolkit v.11.10 in our Faxing product and have been getting reports from customers that use the USR5633A USB modem from US-Robotics, saying that the COM port shows as closed to our software. This issue did not occur in the previous version of our product, where we used the 10.x versions of the toolkit.
Basically what happens, is that the port for this modem shows as closed, even when the modem should show as idle/available. Windows can query the modem properly and we were able to dial out with phone dialer/ hyperterminal.
Is there a known compatibility issue with the Blackice Fax Toolkit v11.10 and the US Robotics USR5633A USB modems?