<!-- Basic tel scheme format -->
<a id="$name" href="tel:+1-303-499-7111">Call Me!</a>
<!-- Dial a number with an extension (example: 55)
<a id="$name" href="tel:+1-303-499-7111,55">Call Me!</a>
You can also send DTMF tones to access tone-controlled services 
     like helpdesk systems, voicemail, etc.. 
     <a id="$name" href="tel:+1-303-499-7111;postd=p123#">Call Me!</a>
     The above will dail the number and take a pause for a second,
     then dial 123#. DTMF tones compatibility is limited depending on
     every device. My recommendation is to avoid using it. -->