When you encounter sustained and reproducible audio quality problems, you can capture audio traffic signals, which a support team can use to diagnose the problem. These signals are drawn from the original audio signal that the user either sends or receives. The signal is captured by sub-sampling the speech waveform by a factor of 40, meaning that only 1 out of 40 consecutive samples is retained in the audio records. In addition, the 16-bit samples are quantized to 8-bit samples. No other type of data processing, data encryption, or data scrambling is applied.

This feature is typically used for a peer-to-peer test call and is turned off after testing is complete. Remember to comply with legal requirements related to privacy and to sampling conversations.

This feature is also available in Communicator. For more information, see the Microsoft Office Communicator 2007 R2 Deployment Guideat http://go.microsoft.com/fwlink/?linkid=140471 .

To join the local Performance Log Users group

1. Click Start, right-click Computer, and then click Manage.
   
   
2. Expand System Tools, expand Local Users and Groups, and then click Groups.
   
   
3. Right-click Performance Log Users, click Add to Group, and then click Add.
   
   
4. Type your domain account, click Check Names, and then click OK.
   
   
5. Restart the Live Meeting client.
   
   

To enable the audio capture feature for the Live Meeting client

1. Click Start, and then click Run.
   
   
2. In the Openbox, type REGEDIT, and then click OKto start Registry Editor.
   
   
3. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Tracing\WPPMedia.
   
   
4. Create a new registry key named DebugUI.
   
   
5. Create a property named TraceLevelThreshold, right-click the new property, and then click Modify.
   
   
6. Select Decimal, enter a value of 5, and then click OK.
   
   
7. Create a property named WPP_FLAG_S_DEBUGUI_AEC_PCM, right-click the new property, and then click Modify.
   
   
8. Right-click the property, and then select Modify.
   
   
9. Select Decimal, enter a value of 1, and then click OK.
   
   
10. Exit Registry Editor.
    
    
11. Start the Office Live Meeting client.
    
    

Data is captured in a circular buffer, which is 20 MB by default. This limits the size of the file that will be saved in the file system. If the capture exceeds the size of the buffer, the old data will be overwritten starting at the beginning of the buffer. At 20 MB, the maximum amount of audio data saved in the file is approximately two hours—about 1 MB for every 6 seconds of audio.

By default, the audio samples are written to the following file:

C:\Users\ username\Tracing\WPPMedia\LiveMeeting_rtmdebug.etl

The path and filename are specified in the following registry properties:

HKEY_CURRENT_USER\Software\Microsoft\Tracing\WppMedia\Debug\WPPFilePath

HKEY_CURRENT_USER\Software\Microsoft\Tracing\WppMedia\Debug\WPPFileName

When the test is complete, disable the audio capture and send your audio files to Microsoft.

To disable the audio capture feature for the Live Meeting client

1. Click Start, and then click Run.
   
   
2. In the Open box, type REGEDIT, and then click OKto start Registry Editor.
   
   
3. Navigate to the HKEY_CURRENT_USER\Software\Microsoft\Tracing\WPPMedia\DebugUIkey.
   
   
4. Right-click DebugUI, and then click Delete.