问题：国际传真应该怎么发啊？

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我用国内地址做的一个广告，怎么也要我传真W-8表格啊？大家看下是这个意思吧？
This is your reminder that in order for us to issue any payments, it is imperative that we have the following documents on file:
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0 D7 d) y% e. Z0 r$ UW-9 Form (For companies based in the United States) located here: http://www.irs.gov/pub/irs-pdf/fw9.pdf Companies that are located outside the US, please visit http://www.irs.gov/ to determine which W-8 form is the right one for you.
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* v% |  p, c1 iPlease type or print clearly and initial the lower right corner of each page and include your Affiliate ID number in the upper right corner of each page.

请问W-8表格一共有几种啊，他为什么叫我去选适合我的W-8表格呢（我用的是中国的地址），另外，发国际传真除了直接打电话还有什么方法啊，找了以前的老贴说有用IP卡的，能不能帮忙说详细些？