Microsoft KB Archive/812460

= Poor Sound Quality in Windows Messenger over a VPN Connection =

Article ID: 812460

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
You may experience poor sound quality in Microsoft Windows Messenger when you use this component over a virtual private network (VPN) connection.



CAUSE
This problem may occur if your VPN connection is configured to use a dial-up modem connection to the Internet.

In this situation, when you use Windows Messenger to make a call to another Windows Messenger client or to the Public Switched Telephone Network (PSTN), Windows Messenger does not use the most bandwidth-efficient audio codec. Windows Messenger uses SIREN when it connects to another Windows Messenger client, or it uses G.711 when it connects to the PSTN. Therefore, the sound quality over the VPN connection in this scenario is poor.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Hotfix information
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) 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 tool in Control Panel.   Date         Time   Version           Size     File name   Platform ---  07-Jan-2003  19:49  5.1.2600.1155     845,312  Dxmrtp.dll   i386 07-Jan-2003 19:50  5.1.2600.1155   1,048,064  Dxmrtp.dll   ia64 03-Jan-2003 17:39  5.1.2600.1155     845,312  Wdxmrtp.dll  ia64



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows XP Service Pack 2.



MORE INFORMATION
For additional information about VPN connections in Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:

314076 HOW TO: Configure a Connection to a Virtual Private Network (VPN) in Windows XP

Keywords: kbhotfixserver kbqfe kbwinxpsp2fix kbqfe kbwinxppresp2fix kbfix kbbug KB812460

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