Installing Modem

Hi;

I wanted to make my E2K server as dial up server too. I installed couple modems, one external and the other internal. The external one accepts a call(works ok) the internal one rings and drops the call. I went to device manager and checked the modem, it says the modem is in working condition. I suspect there is a conflict but I do not see “Resource” tap when I click on the properties of the HW. What would be the solution for this problem or please let me know if there is a work around.
Thank you,