Were you able to come to any resolution regarding this issue?
We are seeing RPD having same issue of not answering, specifically on Windows 7 machines. You can see the incoming call but nothing happens when you click the Answer button. I believe it is windows firewall related, its our corp policy to have it running. On the same Windows 7 machine, CMAD can answer calls. We have added the following to the windows firewall exception list - 1719 udp, 1720 tcp, 3230 - 3237 udp and tcp, and realpresencedesktop.exe. I do believe this is firewall related as CMAD would not answer until the 3230 - 3237 udp and tcp range was added to the exception list.