[1] FaceTime Links ( 版) <https://developer.apple.com/library/ios/featuredarticles/iPhoneURLScheme_Reference/FacetimeLinks/FacetimeLinks.html#//apple_ref/doc/uid/TP40007899-CH2-SW1>
<a href="facetime:14085551234">Connect using FaceTime</a>
<a href="facetime:user@example.com">Connect using FaceTime</a>
facetime:// 14085551234
facetime://user@example.com