How to set up a philips voip0801B/79 phone on xp?

(this buzz is connected by usb)
I am receiving my broadband through exetel and have a billion BiPAC 5200G router.
The only sound that I can hear on my buzz is what is held to come out of my speakers.
Can anyone help please. I dont know any thing about the audio setup and have never dealt with voip before so am voip illiterate.
Do I need anything else for it to work.
Maybe I should mention that I live in Australia

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