A USB telephony device that is installed on a Windows Vista-based computer is unexpectedly set as the default audio device

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Article ID: 936004 - View products that this article applies to.
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SYMPTOMS

After you install a universal serial bus (USB) telephony device on a Windows Vista-based computer, this device is unexpectedly set as the default audio device. The USB telephony device can be a USB telephone, a USB handset, or a USB headset. This behavior occurs even though other audio devices are already installed on the computer.

In this situation, the computer cannot correctly play media or record media.

CAUSE

This problem occurs because the system does not check the device type of the newly installed audio device. Instead, the system sets the newly installed device as the default audio device even though the device is a telephony device.

RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
935791 How to obtain the latest Windows Vista service pack

Hotfixes and security updates that are included in SP2 for Windows Vista Service and for Windows Server 2008

For more information about the hotfixes and the security updates that are included in SP2 for Windows Vista and for Windows Server 2008, visit the following Microsoft TechNet Web site: -
http://technet.microsoft.com/en-us/library/dd335033.aspx
Note: Currently, the list of hotfixes and security updates is available only in English.

Update information

The following files are available for download from the Microsoft Download Center:

Windows Vista, 32-bit versions

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Download the 936004 package now.

Windows Vista, 64-bit versions

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Download the 936004 package now.

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.

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this update.

Update replacement information

This update does not replace any other updates.

File information

The English version of this update 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.
Windows Vista, 32-bit versions
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File nameFile versionFile sizeDateTimePlatform
Update.mumNot Applicable1,78719-Apr-200720:07Not Applicable
X86_1c84239218309afec9ac7d93795fd780_31bf3856ad364e35_6.0.6000.20581_none_f9e95f710cf6b0b3.manifestNot Applicable70319-Apr-200720:07Not Applicable
X86_microsoft-windows-audio-audiocore_31bf3856ad364e35_6.0.6000.20581_none_74ed9f6a00d6cd44.manifestNot Applicable139,51519-Apr-200720:20Not Applicable
Audiocore.mofNot Applicable4,34907-Jan-200705:26Not Applicable
Audiodg.exe6.0.6000.2058188,06419-Apr-200701:35x86
Audioeng.dll6.0.6000.20581398,84819-Apr-200702:12x86
Audiokse.dll6.0.6000.20581273,40819-Apr-200702:12x86
Audioses.dll6.0.6000.20581115,71219-Apr-200702:12x86
Audiosrv.dll6.0.6000.20581310,27219-Apr-200702:12x86
Encdump.dll5.0.1.1169,98419-Apr-200702:13x86
Windows Vista, 64-bit versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Amd64_c178c4416c36c8e38ba9bb7f5a319610_31bf3856ad364e35_6.0.6000.20581_none_3f6b32385bdc9bdc.manifestNot Applicable70719-Apr-200720:07Not Applicable
Amd64_microsoft-windows-audio-audiocore_31bf3856ad364e35_6.0.6000.20581_none_d10c3aedb9343e7a.manifestNot Applicable139,55719-Apr-200720:24Not Applicable
Update.mumNot Applicable1,79719-Apr-200720:07Not Applicable
Audiocore.mofNot Applicable4,34907-Jan-200705:26Not Applicable
Audiodg.exe6.0.6000.20581111,10419-Apr-200702:01x64
Audioeng.dll6.0.6000.20581480,76819-Apr-200703:21x64
Audiokse.dll6.0.6000.20581311,29619-Apr-200703:21x64
Audioses.dll6.0.6000.20581193,02419-Apr-200703:21x64
Audiosrv.dll6.0.6000.20581445,44019-Apr-200703:21x64
Encdump.dll5.0.1.1200,70419-Apr-200703:21x64

WORKAROUND

To work around this problem, reset the device of your choice as the default audio device. To do this, follow these steps:
  1. Click Start, and then click Control Panel.
  2. In Control Panel, double-click Sound.
  3. On the Playback tab, click the audio device that you want in the Select a playback device below to modify its settings list, and then click Set Default.
  4. On the Recording tab, click the audio device that you want in the Select a playback device below to modify its settings list, and then click Set Default.
  5. Click OK.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about the same problem in Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:
935708 A USB telephony device that is installed on a Windows XP-based computer is unexpectedly set as the default audio device
For more information about how to determine an audio device type, visit the following Microsoft Web site:
http://msdn2.microsoft.com/en-us/library/ms790325.aspx
For more information, 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

Properties

Article ID: 936004 - Last Review: October 8, 2011 - Revision: 4.0
APPLIES TO
  • Windows Vista Ultimate
  • Windows Vista Home Premium
  • Windows Vista Home Basic
  • Windows Vista Enterprise
  • Windows Vista Business
  • Windows Vista Business 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Enterprise 64-bit Edition
Keywords: 
atdownload kbvistasp1fix kbwinvistapostrtmfix kbexpertisebeginner kbexpertiseinter kbbug kbfix kbqfe KB936004

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