How to change the sound input and output in the Legacy Softphone
From PhonePower Knowledge Base
To change the sound input and output for your softphone, please follow these instructions.
• Log into the softphone application.
• Right click anywhere in the application window and select Options.
• Click Audio Options and then Audio Devices.
• Select the input/output method that you wish to use. The default should be Microsoft Sound Mapper.
• Click Apply to save any changes.