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Telephony API (TAPI)-based applications may stop responding in a Microsoft Windows Server 2000-based telephony server. Additionally, you cannot disconnect telephone calls even though the remote party has disconnected.
This problem occurs if the following conditions are true:
A telephone call is being disconnected.
The server is located in a large telephony server call center.
The telephony server has more than one CPU.
This problem occurs because of a deadlock condition between the lineClose function call and the lineDeallocateCall function call.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
To apply this hotfix, you must have Windows 2000 Service Pack 4 (SP4) installed on the computer.
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix is not replaced by any later hotfix.
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about Microsoft Windows Server 2003 version of this hotfix, click the following article number to view the article in the Microsoft Knowledge Base:
924050 Telephony API-based applications stop responding and you cannot disconnect telephone calls on a Windows Server 2003-based telephony server
For more information about the terms that are used to describe software updates, 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