<div dir="ltr">I believe you are looking for STIR / SHAKEN.<div><a href="https://www.sipforum.org/download/an-introduction-and-overview-of-the-stir-shaken-framework/">https://www.sipforum.org/download/an-introduction-and-overview-of-the-stir-shaken-framework/</a> </div><div><a href="https://datatracker.ietf.org/wg/stir/documents/">https://datatracker.ietf.org/wg/stir/documents/</a> </div><div> <br></div><div>Thanks</div><div>Ramesh <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 17, 2019 at 4:15 PM Nathan Neulinger <<a href="mailto:nneul@mst.edu">nneul@mst.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
  

    
  
  <div bgcolor="#FFFFFF">
    <p>All of the articles I've seen are just the dumbed down public
      info with an occasional technical buzzword thrown in.</p>
    <p><br>
    </p>
    <p><a class="gmail-m_-2171401471829876128moz-txt-link-freetext" href="https://tech.slashdot.org/story/19/04/17/1659243/t-mobile-comcast-turn-on-call-verification-between-networks-in-latest-robocall-fight" target="_blank">https://tech.slashdot.org/story/19/04/17/1659243/t-mobile-comcast-turn-on-call-verification-between-networks-in-latest-robocall-fight</a><br>
    </p>
    <pre class="gmail-m_-2171401471829876128moz-signature" cols="120">-- Nathan
 ------------------------------------------------------------
Nathan Neulinger                            <a class="gmail-m_-2171401471829876128moz-txt-link-abbreviated" href="mailto:nneul@mst.edu" target="_blank">nneul@mst.edu</a>
Missouri S&T Information Technology         (573) 341-6679
System Administrator - Architect            (573) 612-1412
System and Desktop Infrastructure Team Manager</pre>
  </div>

_________________________________________________________________________<br>
<br>
The FreeSWITCH project is sponsored by SignalWire <a href="https://signalwire.com" rel="noreferrer" target="_blank">https://signalwire.com</a><br>
Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.<br>
Build your next product on our scalable cloud platform.<br>
<br>
Join our online community to chat in real time <a href="https://signalwire.community" rel="noreferrer" target="_blank">https://signalwire.community</a><br>
<br>
Professional FreeSWITCH Services<br>
<a href="mailto:sales@freeswitch.com" target="_blank">sales@freeswitch.com</a><br>
<a href="https://freeswitch.com" rel="noreferrer" target="_blank">https://freeswitch.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="https://freeswitch.com/oss" rel="noreferrer" target="_blank">https://freeswitch.com/oss</a><br>
<a href="https://freeswitch.org/confluence" rel="noreferrer" target="_blank">https://freeswitch.org/confluence</a><br>
<a href="https://cluecon.com" rel="noreferrer" target="_blank">https://cluecon.com</a><br>
<br>
FreeSWITCH-users mailing list<br>
<a href="mailto:FreeSWITCH-users@lists.freeswitch.org" target="_blank">FreeSWITCH-users@lists.freeswitch.org</a><br>
<a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" rel="noreferrer" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" rel="noreferrer" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
<a href="https://freeswitch.com" rel="noreferrer" target="_blank">https://freeswitch.com</a></blockquote></div>