Error when calling a URL

[JohnPapa]

With the current telephone system (3CX) I was given the option of the URL that I indicate.

 

[Gasman]

Might want to ask at the 3cx forum?
This link advises to use the tel: format

URL in CRM to trigger Desk phone to call number

I can put a link behind a Phone number in our CRM. How does the link has to look like, so that the phone on my desk, not the web client, calls the number from the CRM? The CRM knows how is in front (login), so it knows the desk phone extension. Like...

www.3cx.com