<https://secure.gravatar.com/avatar/7a572ade1388334ee0410f55d51e7b1b?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://switch2voip.us/a2b-setting-up-a-sip-trunk-in-a2billing/>