Of course that's what somebody using the Skype "Click To Call" feature wants, linking every number which resembles a phone number and making your browsing experience even more taxing.. but I digress.
There are URL types of SIP and TEL, but I don't believe either are associated with 3CX Phone or MyPhone (or soon "both in one").. but I imagine that "it could".
I tested a couple of HREFs for SIP:
[email protected] as well as TEL:15035551234.. both could be told how to open something, sure. I suppose if you could train Windows to open these types using something, it might work. Seems beyond scope for a web dev guy, however.
Again, sounds like a Skype user wants 3CX to do that, too. Submit a feature request.
If the do implement, it would be nice to see it match on the app store.. I saw other SIP/VOIP clients come up on the offer, but not 3CX.