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<p class="MsoNormal"><span style="color:#1F497D">I have had this happen a few times in the past.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Scenario:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Pay day loan scam, the caller knew the users name and work number, demanded to talk to them to get them to pay. When refused, they sent 4 or 5 simultaneous calls to the users work number (usually main
department numbers) tying up that department.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Created a UCCX script that compared the callers ANI to a list of known ANIs that they were using, if it matched, it would answer and play a 30 second busy signal wav file. The reason for answering was to tie
up all of their calls and not actually ending them. In our experience they never used more than a handful at the same time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If the call did not match the list of known ANIs, then the call went to a menu where the caller would have to enter a digit to be connected. This stopped the robo calls from getting through to the actual user
or department. I built it with text to speech for the digit incase I needed to switch the digit on the fly without having the user re-record the greeting. It never came to that level of need.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The menu does not stop the actual caller from pressing the digit and trying to get their money, but it does stop the robo calls.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">This was back in the MGCP/PRI days.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> cisco-voip [mailto:cisco-voip-bounces@puck.nether.net]
<b>On Behalf Of </b>Matthew Loraditch<br>
<b>Sent:</b> Monday, April 16, 2018 9:45 AM<br>
<b>To:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> [cisco-voip] Robo Call DoS<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<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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<p class="MsoNormal"><b><span style="color:#F3800B">Matthew Loraditch</span></b><b><span style="font-family:"remialcxesans",serif;color:#F3800B"></span></b><b><span style="color:#F3800B"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="color:gray">Sr. Network Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="color:#F3800B">p:</span><span style="color:gray"> </span><a href="tel:443.541.1518" target="_blank" id="LPlnk689713"><strong><span style="font-family:"Calibri",sans-serif;color:gray;font-weight:normal;text-decoration:none">443.541.1518</span></strong></a><span style="color:gray"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#F3800B">w:</span><span style="color:gray"> </span><a href="http://www.heliontechnologies.com/" target="_blank" id="LPlnk689713"><strong><span style="font-family:"Calibri",sans-serif;color:gray;font-weight:normal;text-decoration:none">www.heliontechnologies.com</span></strong></a><span style="color:gray"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:gray"> | <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#F3800B">e:</span><span style="color:gray"> </span><a href="mailto:MLoraditch@heliontechnologies.com" target="_blank" id="LPlnk689713"><strong><span style="font-family:"Calibri",sans-serif;color:gray;font-weight:normal;text-decoration:none">MLoraditch@heliontechnologies.com</span></strong></a><span style="color:gray"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
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