thx, here's what I've found
1) The Skype for Web seems like an alternative to installing the full app - made no diff. on my Mac
2) On a Mac, a click on a phone# will launch Facetime - apparently this is a setting in the OS - I'm supposed to be able to tell Facetime to not be the default (and use Skype) but this is broke on my OS. New Skype install didn't help.
3) Will try on a PC
I'd rather call a specific app/plugin/etc. - but then that would reply on users installing something on their machine - in some environs. this would be acceptable. Do THIS or you don't get a dialer.