Article ID: 923829 - Last Review: September 11, 2007 - Revision: 1.4 Error message when you try to use Communicator 2005 to log on to Live Communications Server 2005: "Signing in to SIP failed"SYMPTOMSWhen you try to use Microsoft Office Communicator 2005 to log on to Microsoft Office Live Communications Server 2005, Communicator 2005 may fail, and you may receive the following error message:
Signing in to SIP failed because the service is temporary unavailable.
15:41:29.735 D98:C94 ERROR :: RoamingSessionEx::ProcessXML failed:80004005 CAUSEThis problem may occur because of a mismatched or unregistered Msxml3.dll file. RESOLUTIONThis problem is fixed in the Communicator 2005 hotfix package that was released on October 19, 2006.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
926404
(http://support.microsoft.com/kb/926404/
)
Description of the Communicator 2005 hotfix package: October 19, 2006
MORE INFORMATION
For more information about this problem and its causes, click the following article number to view the article in the Microsoft Knowledge Base:
322129
(http://support.microsoft.com/kb/322129/
)
PRB: MSXML TypeLib version information in registry does not change after you remove the 4.0 parser
STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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