The Audio Compression Manager failed to convert from the audio format “%1” to audio format “%2”: “%3”. If this conversion continues to fail, you can either change the audio codec setting on the UM dial plan or change the audio codec setting on the user’s UM-enabled mailbox.

Details
Product: Exchange
Event ID: 1127
Source: MSExchange Unified Messaging
Version: 8.0
Symbolic Name: AcmConversionFailed
Message: The Audio Compression Manager failed to convert from the audio format “%1” to audio format “%2”: “%3”. If this conversion continues to fail, you can either change the audio codec setting on the UM dial plan or change the audio codec setting on the user’s UM-enabled mailbox.
   
Explanation

This Warning event indicates that the Microsoft® Audio Compression Manager (ACM) did not convert recorded voice mail data from one format type to another. ACM manages the compressor and decompressor (codec) drivers to change the format. For example, the codec drivers can change a Pulse Code Modulation (PCM) file to a Microsoft Windows Media® Audio (WMA) file to support different audio output. ACM can also change just the format type but not the data type. For example, it can change a PCM file from 8-kilohertz (kHz), 8-bit to 8-kHz, 16-bit data. Another symptom that you may experience when this event occurs is that the audio prompts played by Unified Messaging (UM) may not play correctly. This event may be caused when either the following conditions are true:

  • A problem exists with the audio controller, such as a built-in or add-on sound card installed on the server.

  • An incorrect, missing, or corrupted audio codec is installed on the server.

   
User Action

To resolve this warning, do one or more of the following:

  • Make sure that the audio devices support GSM 6.10 Audio codec, G.711 Audio codec, or WMA codec.

  • Use Device Manager to verify that the audio controller and installed codec is enabled and working correctly.

  • Change the codec that is used by the UM dial plan to a codec that is supported by the audio controller. For more information about how to change the audio codec, see How to Change the Audio Codec.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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