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Article ID: 956831 - Last Review: January 16, 2015 - Revision: 3.0

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This article describes the Microsoft Office Communications Server 2007 issues that are fixed in the update package that is dated October, 2008.


List of issues fixed

This update fixes the following issues:
  • 957489  ( ) The packet interval of 60ms for audio RTP packets from the Audio Video Conferencing Server may cause latency and performance issues over bandwidth connections
  • 957595  ( ) Conference calls are disconnected when you customize the codec selection policy for the Communications Server 2007 Audio Video Conferencing Server or for the Office Communicator 2007 client
  • 957648  ( ) Audio quality decreases during a conference call that is hosted on a Communications Server 2007 Audio/Video Conferencing Server when Communications Server 2007 clients report packet loss

Installation issues

In some cases, after you install this update, you my receive the following error message on the computer that is running Communications Server 2007 and that has the Audio Video Conferencing Server role installed:
Error 1053: The service did not respond to the start or control request in a timely fashion.
If you receive this error message after you install the update, create the AvMcuSvc.exe.config file. To do this, follow these steps:
  1. Start Notepad.
  2. Paste (or type) the following text in Notepad:
    <generatePublisherEvidence enabled="false"/>
  3. On the File menu, click Save, and then name the file AvMcuSvc.exe.config.
  4. Save the file in the same location as the Avmcusvc.exe. By default, this location is as follows:
    %Program Files%\Microsoft Office Communications Server 2007\AV Conferencing
Start Services.msc, and then start the Office Communications Server Audio/Video Conferencing service. By using the AvMcuSvc.exe.config configuration file, the Authenticode signature verification process is bypassed for Avmcusvc.exe and all dependent binaries. Also, the Audio Video Conferencing Services starts in time.

Note This workaround works only with the Microsoft .NET Framework 2.0 Service Pack 1 (SP1) or later versions. Additionally, use this workaround only if you receive the following error after you apply the update for AVMCU server:
Error 1053: The service did not respond to the start or control request in a timely fashion.

More information

Update package information

To obtain this update, visit the following Microsoft Update Web site: (
The update appears in the High-Priority Updates section under Microsoft Office Communications Server 2007. For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591  ( ) How to obtain Microsoft support files from online services
Microsoft 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.

If you are an administrator, you may want to download this update and then distribute it to clients. To download the update to a folder of your choice, visit the following Microsoft Web site: (
When you search for Communications Server 2007, all the updates that are available for Communications Server 2007 appear.


There are no prerequisites for installing this update package.

Restart information

You do not have to restart the computer after you apply this update package.

Removal information

To remove this update package, use the Add or Remove Programs feature in Control Panel.

Sometimes, when you try to uninstall the update package, you are prompted for the source CD. If this behavior occurs, insert the source CD, or provide the path where the source files can be found.

Update package installation information

Install the installation packages on individual computers as described in the following table.
Collapse this tableExpand this table
Installation package Installed on
OCS2007-KB956831-x86-AudioVideoMCU.msp A computer that is running Communications Server 2007 and that has the Audio Video Conferencing Server role installed

Hotfix replacement information

This update package replaces the following update package:
946763  ( ) Description of the update package for Communications Server 2007 (Web Components, Admin Tools, Web Conferencing, Audio Video, Mediation, Archiving, and Server): January 31, 2008

Registry information

To use one of the updates in this package, you do not have to make any changes to the registry.

File information

This update package may not contain all the files that you must have to fully update a product to the latest build. This update package contains only the files that you must have to correct the issues that are listed in this article.

After the update is installed, the global version of this update has the file attributes, or a later version of the file attributes, that are listed in the following table:

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684  ( ) Description of the standard terminology that is used to describe Microsoft software updates

Applies to
  • Microsoft Office Communications Server 2007 Standard Edition
  • Microsoft Office Communications Server 2007 Enterprise Edition
kbnosurvey kbarchive kbupdate kbnetwork_latencyperformance kbexpertiseinter kbqfe kbHotfixServer KB956831
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