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<p class="MsoNormal">So this is a curiosity question, we had a prospective client call us who is essentially getting robocalled to oblivion. Some scammer has robo dialers setup and is flooding all of their trunks. He got a ransom, stopped and then started again.
He was originally using one number and then when the telco blocked that switching to random sources.<o:p></o:p></p>
<p class="MsoNormal">Are there are any legitimate defenses to this sort of thing?<o:p></o:p></p>
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<div style="mso-line-height-rule:exactly;-webkit-text-size-adjust:100%;"><table cellpadding="0" cellspacing="0" border="0" style="width:100%;font-size:0;"><tr><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="font-size:0;"><tr><td style="padding:0 10px 0 0;"> </td><td align="left" style="padding:10px 0 10px 10px;vertical-align:middle;"><table cellpadding="0" cellspacing="0" border="0" style="width:100%;font-size:0;"><tr style="font-size:14.67px;color:#F3800B;font-style:normal;font-weight:700;white-space:nowrap;"><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">Matthew Loraditch<span style="font-family:remialcxesans;"></span></td></tr><tr><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="font-size:14.67px;color:#808080;font-style:normal;font-weight:700;white-space:nowrap;"><tr><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;">Sr. Network Engineer</td></tr></table></td></tr><tr><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="font-size:0;"><tr><td align="left" style="padding:10px 0 0;vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="font-size:14.67px;color:#808080;font-style:normal;font-weight:400;white-space:nowrap;"><tr><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"><span style="color:#F3800B;">p:</span> <a href="tel:443.541.1518" target="_blank" id="LPlnk689713" style="text-decoration:none;color:#808080;"><strong style="font-weight:400;">443.541.1518</strong></a></td></tr></table></td></tr></table></td></tr><tr><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="font-size:14.67px;color:#808080;font-style:normal;font-weight:400;white-space:nowrap;"><tr><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"><span style="color:#F3800B;">w:</span> <a href="http://www.heliontechnologies.com/" target="_blank" id="LPlnk689713" style="text-decoration:none;color:#808080;"><strong style="font-weight:400;">www.heliontechnologies.com</strong></a></td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"> | </td><td align="left" style="vertical-align:top;font-family:Calibri,Arial,sans-serif;"><span style="color:#F3800B;">e:</span> <a href="mailto:MLoraditch@heliontechnologies.com" target="_blank" id="LPlnk689713" style="text-decoration:none;color:#808080;"><strong style="font-weight:400;">MLoraditch@heliontechnologies.com</strong></a></td></tr></table></td></tr><tr><td align="left" style="vertical-align:middle;"><table cellpadding="0" cellspacing="0" border="0" style="font-size:0;line-height:normal;"><tr><td align="left" style="vertical-align:bottom;"><img src="cid:image164818.png@93BA584B.3B5FAD34" 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