Set sip/tel URL/LSHandler back to OS X Mac Continuity/Wifi Calling instead of Skype

Question

I recently installed skype for business and it hijacked my Mac's ability to make calls via my iPhone (Continuity) or Wifi Calling. I wanted to know how to set it back, but I figured it out before i posted this question. So answer is below. (Source)

Answer 1

The following plist (Source) needs to be edited. I suggest 'duplicating' the file first, so you will have a backup if needed.

~/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist

If you have Xcode, you can just open/edit the plist directly (not in the scope of this answer), but if not, it needs to be converted from binary to XML format since textedit can't open it as-is.

To convert it into XML, use the following command (Source) in terminal.

plutil -convert xml1 /Users/$USER/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist 

Open the file and then search (CMD+F) for skype or <string>tel</string>

Either delete the following structure, or edit it, by commenting it out using <--! and --> at the top and bottom of the <dict> (Source)

Before:

<dict>
    <key>LSHandlerPreferredVersions</key>
    <dict>
        <key>LSHandlerRoleAll</key>
        <string>-</string>
    </dict>
    <key>LSHandlerRoleAll</key>
    <string>com.microsoft.skypeforbusiness</string>
    <key>LSHandlerURLScheme</key>
    <string>tel</string>
</dict>

After:

<!--
<dict>
    <key>LSHandlerPreferredVersions</key>
    <dict>
        <key>LSHandlerRoleAll</key>
        <string>-</string>
    </dict>
    <key>LSHandlerRoleAll</key>
    <string>com.microsoft.skypeforbusiness</string>
    <key>LSHandlerURLScheme</key>
    <string>tel</string>
</dict>
-->

Save the file and reboot.