When I attempted to configure one of our user’s Meeting settings using the Microsoft Office Communications Server 2007 R2 Administration Tool
I received an Validation failed – Validation failed with HRESULT = 0XC3EC7E02 dialog box error message.
I received the same error message when I tried to configure the user’s Telephony and Other settings.
Using ADSI Edit, I compared the settings of an user that I had no problems configuring and the user that I had problems configuring. For the user I had problems configuring, I noticed a trailing space after the last phone number digit for the user’s msRTCSIP-Line attribute.
After I removed the trailing space for the attribute and waited for Active Directory replication to complete, I was able to configure the user’s Meeting settings (and Telephony/Other settings) without any problems.
If you get the error message, check your user’s msRTCSIP-xxxxx attributes in Active Directory using ADSI Edit for any trailing spaces, typos, or any other mistakes.