I recently got a question from somebody who has a personal site on the web and he wanted to disable the phone number linking on his own site (which is rendered automatically in the Safari application of an iPad). I first assumed that such request could not be answered, but I came across following solution:
If you include the following meta tag at the top of your page:
<meta name="format-detection" content="telephone=no">
... phone linking will be disabled. More information can be found on the developer pages of Apple: https://developer.apple.com/library/ios/featuredarticles/iPhoneURLScheme_Reference/PhoneLinks/PhoneLinks.html
for fax please?
For fax, it should be the same. I guess your fax number is similar to your phone number?