<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div>We handle a lot of toll-free traffic and we can compensate carriers who send us their toll-free traffic, because we're able to bill the term LEC and "spread the wealth" as it were. The unfortunate downside is customers who generate fraudulent traffic (dead air, background noise) to do "traffic pumping." It's not difficult to detect, we monitor traffic on new toll-free customers (one-way RTP streams, exact same ALOC for connected calls, lots of calls from the same ANIs...) but it does slip through every now and again. We've disconnected a handful of customers for pulling this one. Where there's "free money" to be made, you can bet someone is generating nonsense and sending it your way.<br></div><div><br></div><div>I don't think it's specifically targeted (we've had our customers ask us about random dead-air calls to their toll-free numbers) but it sure is frustrating.</div><div><br>Probably not a security risk, just annoying fraud. The bigger carriers who are paying out on the toll-free traffic will scrutinize this stuff to no end, so whoever is responsible for originating that traffic or billing AT&T or Verizon is going to get a nice surprise come billing time...</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>---------- Forwarded message ----------<br>From: Ivan Kovacevic <<a href="mailto:ivan.kovacevic@startelecom.ca">ivan.kovacevic@startelecom.ca</a>><br>To: <a href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a><br>Cc: <br>Date: Tue, 14 Apr 2015 10:31:16 -0400<br>Subject: [VoiceOps] Dead Air calls to TFNs<br><div lang="EN-CA" link="#0563C1" vlink="#954F72"><div><p class="MsoNormal">Over the last 3 months we have seen a marked increase in dead air calls to Toll Free numbers that belong to us, our customers, etc. </p><p class="MsoNormal"> </p><p class="MsoNormal">If there is an answering machine on the other side, these calls result in a dead air voice message of few seconds in duration. If a live person picks up they won’t hear anything on the other side and the line stays connected (didn’t measure for how long, but more than 60 sec). The volume varies daily but ranges from 0 to 4-5 calls per day. </p><p class="MsoNormal"> </p><p class="MsoNormal">Calls come from US ANIs (925, 631 area codes for example), but ANI is easily spoofed so doesn’t really mean much. In fact, when we called some of the numbers we got private residences of folks who did not call us. </p><p class="MsoNormal"> </p><p class="MsoNormal">Other than the nuisance factor (our support line is getting the calls as well) and a small additional cost there doesn’t seem to be a real impact. </p><p class="MsoNormal"> </p><p class="MsoNormal">Are these just war-dialling attacks to find back doors? </p><p class="MsoNormal"> </p><p class="MsoNormal">Is anyone else seeing the same? Are you doing anything to prevent it?</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="color:#1f497d">Best Regards,</span><span></span></p><p class="MsoNormal"><span style="color:#1f497d"> </span><span></span></p><p class="MsoNormal"><span style="color:#1f497d">Ivan Kovacevic</span><span></span></p><p class="MsoNormal"><span lang="EN-US" style="color:#1f497d">Vice President, Client Services</span><span></span></p><p class="MsoNormal"><span style="color:#1f497d">Star Telecom | <a href="http://www.startelecom.ca/" target="_blank"><span style="color:blue">www.startelecom.ca</span></a> | SIP Based Services for Contact Centers </span><span></span></p><p class="MsoNormal"> </p></div></div>
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