It&#x27;s telco VOIP. Anyone can get it, e.g. <a href="https:&#x2F;&#x2F;www.sipgate.co.uk&#x2F;basic&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.sipgate.co.uk&#x2F;basic&#x2F;</a><p>And there are various providers which will let you do &#x27;trunking&#x27; into the phone system, so you can have any number of handsets with the same origination number appearing on outgoing caller ID.