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This feature its useful for an Agent when he/she changes workstation or office, but still be able to make call on their extension.
When enabled, every time you log in to DaFeeder it will prompt you to set your extension like the image below
Under the Installed Plugins section, it displays the available plugins for DaFeeder and their status. This is where you choose to activate or deactivate a plugin on your DaFeeder. Each plugin contains an official name and a brief description.
Simply 
or 
according to your needs and finish by 