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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Technically. For a network there is gear that can do it. Radware among one of them and the one we use via our carrier and it works. An effective defense has to
have a larger pipe somewhere with mitigation services at a capacity well above your capacity.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I don’t think the CAPTCHA would work, the person just calls and calls tying up the available trunks. You’d need the CAPTCHA to be on the attacker’s end. Based
on the description I got they aren’t caring about an answer they are essentially just trying to keep the lines always busy.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><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:image055357.png@4E169F5F.2A785269" width="400" height="68" border="0" alt="" style="width:400px;min-width:400px;max-width:400px;height:68px;min-height:68px;max-height:68px;font-size:0;" /></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:0;"><tr><td align="left" style="vertical-align:top;"><table cellpadding="0" cellspacing="0" border="0" style="width:100%;font-size:0;line-height:normal;"><tr><td align="center" style="padding:0 3px 0 0;vertical-align:top;"><a href="https://facebook.com/heliontech" target="_blank" id="LPlnk689713" style="text-decoration:none;"><img src="cid:image504403.png@9B0CF069.52DABF14" width="18" height="18" border="0" 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href="https://www.linkedin.com/company/helion-technologies" target="_blank" id="LPlnk689713" style="text-decoration:none;"><img src="cid:image883793.png@A4B43534.E7AEFF11" width="18" height="18" border="0" title="LinkedIn" alt="LinkedIn" style="width:18px;min-width:18px;max-width:18px;height:18px;min-height:18px;max-height:18px;font-size:12px;" /></a></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></div>From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Anthony Holloway <avholloway+cisco-voip@gmail.com>
<br>
<b>Sent:</b> Monday, April 16, 2018 11:23 AM<br>
<b>To:</b> Matthew Loraditch <MLoraditch@heliontechnologies.com><br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] Robo Call DoS<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Technically or legally?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">How does one stop a DoS attack on a network? Or on anything for that matter? Say you were attending a protest, and
<a href="https://youtu.be/cvAMkDGKelQ?t=80">someone is blowing an air horn in your ear</a>? What can you do?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Technically, you could front end the whole thing with a captcha style gate, so you could ask to push a single button, button combination, or solve a simple addition problem resulting in two digits. granted, just like on the web, a captcha
is burdensome to the user, but generally, it's preferable over the site being down, or disrupted.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">CUC and UCCX both could handle this task, though it would be easier in UCCX.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Apr 16, 2018 at 9:49 AM Matthew Loraditch <<a href="mailto:MLoraditch@heliontechnologies.com">MLoraditch@heliontechnologies.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Are there are any legitimate defenses to this sort of thing?<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#F3800B">Matthew Loraditch</span></b><b><span style="font-size:11.0pt;font-family:"remialcxesans",serif;color:#F3800B"></span></b><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#F3800B"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:gray">Sr. Network Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#F3800B">p:</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:gray"> <a href="tel:443.541.1518" target="_blank" id="m_8630719865754711579LPlnk689713"><strong><span style="font-family:"Calibri",sans-serif;color:gray;font-weight:normal;text-decoration:none">443.541.1518</span></strong></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#F3800B">w:</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:gray"> <a href="http://www.heliontechnologies.com/" target="_blank" id="m_8630719865754711579LPlnk689713"><strong><span style="font-family:"Calibri",sans-serif;color:gray;font-weight:normal;text-decoration:none">www.heliontechnologies.com</span></strong></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:gray"> | <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#F3800B">e:</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:gray"> <a href="mailto:MLoraditch@heliontechnologies.com" target="_blank" id="m_8630719865754711579LPlnk689713"><strong><span style="font-family:"Calibri",sans-serif;color:gray;font-weight:normal;text-decoration:none">MLoraditch@heliontechnologies.com</span></strong></a><o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:1.0pt"><a href="https://facebook.com/heliontech" target="_blank" id="m_8630719865754711579LPlnk689713"><span style="text-decoration:none"><img border="0" width="18" height="18" style="width:.1875in;height:.1875in" id="_x0000_i1026" src="cid:image955318.png@CDDA0725.CCC32B2A" alt="Facebook"></span></a><o:p></o:p></span></p>
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<p class="MsoNormal">_______________________________________________<br>
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