Switchboard active call icons

[bbaker73]

Is there a document explaining the different icons and colors for active calls in the Windows switchboard. Not making much sense. Testing internal calls ringing between extensions. The handset symbol appears, but some are blue, some are orange and some are red.

Haven't given it much thought before, but a new client was asking as they are seeing these various colors appear on active calls and wanted to know the meaning.

Thanks.