Voice & video calls between R1/Win 2000 MOC and R2/XPSP2 MOC fail with "Incompatible Security" error
Sunday, October 25, 2009 9:11 PM
Monday, October 26, 2009 6:19 PMI'm now offsite, so I don't have a Windows 2000 system to test with (surprising that MSFT doesn't make Win2K available to technet subscribers any more. I can download 3.11, but not NT4 or Win2K - go figure).
So, I built a lab with XP clients running against an OCS R2 EE infrastructure. I tested an unpatched R1 client on XPSP3 calling an unpatched R2 client on XPSP3 and conducted a voice call with no issue. This makes me think that the issue is between XP and Win2K crypto.
I have this thread, plus a thread in the OCS setup forum, plus an email to Rui Silva, and NOBODY has given me the smallest suggestion of what could be the root cause. So, I'm offering untold riches in reward to anyone who even acknowledges that they've read any of my posts. Furthermore, you'll receive a greater reward if you actually know what I'm talking about.
Thanks again in advance & your soul will be blessed.
Tuesday, October 27, 2009 6:07 PMNobody seems to know the answer to this, probably because nobody uses Windows 2000 any more.
Here's the cause - the R1&R2 MOCs use SRTP for all A/V streams. There is no support for SRTP in Windows 2000.
There are also no KB's that describe this as an issue, despite the R1 MOC being supported on Windows 2000. I presume that's because Windows 2000 is EOL?
So, what I've gathered is that you cannot have voice or video with OCS R1 or R2 and Windows 2000 clients. IM & Presence are the only OCS functions available to any users on Windows 2000.
- Marked As Answer by bradpr Tuesday, October 27, 2009 6:08 PM