Skype business call equivalent to 'sip' for message

I have an hyperlink in my mail signature to launch a Skype IM (sip:[email protected]); I would like to add one to a Skype call, not a call to a phone but a Skype to Skype call; I tried

callto:[email protected]
callto:sip:[email protected]
call:[email protected]

but no cigar. Does any one have an answer?

Solution 1:

Can you try:

 <a href="skype:********?call">Link will initiate Skype to call my Skype username!</a>

Solution 2:

The answer by Brian Folan is correct, according to the Skype blog:

Where you would enter a web address, enter skype: followed by your Skype name. If you want the link to start a chat instead of a call, add ?chat after your Skype name.