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I want to mark up a phone number as callable link in an HTML document. I have read the microformats approach , and I know, that the tel: scheme would be standard, but is quite literally nowhere implemented. Skype defines, as far as I know, skype: and callto: , the latter having gained some popularity. I assume, that other companies have either other schemes or jump on the callto: train. What would be a best practice to mark-up a phone number, so that as many people as possible with VoIP software can just click on a link to get a call? Bonus question: Does anyone know about complications with emergency numbers such as 911 in US or 110 in Germany? Update: Microsoft NetMeeting takes callto: schemes under WinXP. This question suggests, that Microsoft Office Communicator will handle tel: schemes but not callto: ones. Great, Redmond! Update 2: Two and a half years later now. It seems to boil down to what you want to do with the number. In mobile context, tel: is the way to go. Targeting desktops it's up to you, if you think your users are more Skype people ( callto: ) or will more likely have something like Google Voice ( tel: ) installed. My personal opinion is, when in doubt use tel: (in line with @Sidnicious' answer). Update 3: User @rybo111 noted, that Skype in Chrome has meanwhile jumped on the tel: bandwagon. I cannot verify this, because no machine with both at hand, but if it's true, it means we have finally a winner here: tel:

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