Article ID: 950559 - View products that this article applies to.
This article describes the update for the Microsoft Unified Communications Client API SDK.
Update informationThe authentication protocol that is used by Microsoft Office Communications Server 2007 and its clients has been updated to require a signature in all messages. This includes the first message that carries the challenge response.
The version number of the protocol that is advertised in the challenge response has increased to version 4. Challenge responses that use version 4 of the protocol must contain a signature. The signature is a digest of the identifying headers in the message. The signature is calculated by using the session key.
Client applications that are built by using the Unified Communications Client API SDK must use this update to register and to work with Communications Server 2007. Communications Server 2007 requires the first challenge response message to contain a signature.
This update makes the following changes:
Update download informationThe following file is available for download from the Microsoft Download Center:
Download the UccApiSdk.msi package now.
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For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
(http://support.microsoft.com/kb/119591/ )How to obtain Microsoft support files from online services
PrerequisitesThere are no prerequisites for installing this update.
Restart requirementYou do not have to restart the computer after you apply this update.
Update replacement informationThis update replaces the earlier release version of the Unified Communications Client API SDK that was dated October 8, 2007.
For more information about updates that are related to Communications Server 2007, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/949260/ )Description of the Communications Server 2007 update package: March 2008
(http://support.microsoft.com/kb/948738/ )Description of the update for the Conferencing Add-in for Outlook: April 11, 2008
(http://support.microsoft.com/kb/946764/ )Description of the Windows-based Live Meeting 2007 client update package: April 11, 2008
946164Note These updates do not require an API change.
(http://support.microsoft.com/kb/946164/ )Description of the update for Communicator 2007: April 2, 2008
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/LN/ )Description of the standard terminology that is used to describe Microsoft software updates