Article ID: 948737 - View products that this article applies to.
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A Microsoft Office Communicator 2007 user takes a universal serial bus (USB) telephony device handset off the hook. When the user then uses the device to stream audio from another application, the user hears a 30-second-long dial tone mixed with the streaming audio.
This issue occurs because Communicator 2007 cannot detect whether the device is being used by another application such as Microsoft Office Live Meeting or Windows Live Messenger.
To resolve this issue, follow these steps.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows