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<p class="MsoNormal">If that is the case, a scammer that should be either attested C, or not attested at all can game the system and upgrade their calls to any customer of Bandwidth to B. Granted, B attestation isn’t much better than nothing, but still it violates
both the intent and the letter of the law.<o:p></o:p></p>
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<p class="MsoNormal">David Zilk<o:p></o:p></p>
<p class="MsoNormal">CDK Global/IP Networked Services <o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Mark Lindsey <lindsey@e-c-group.com> <br>
<b>Sent:</b> Tuesday, July 5, 2022 9:58 AM<br>
<b>To:</b> Zilk, David <David.Zilk@cdk.com><br>
<b>Cc:</b> voiceops@voiceops.org<br>
<b>Subject:</b> Re: [VoiceOps] [EXTERNAL] Identity Header Test Tool<o:p></o:p></p>
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<p class="MsoNormal">I expect Bandwidth is attesting that they know the identity of the SIP trunking provider that sent your call to Bandwidth. <o:p></o:p></p>
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<p class="MsoNormal">CDK Global -> [term provider 1] -> [term provider 2, Strips Identity Header] -> [term provider 3] -> [<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__Bandwidth.com&d=DwMFAg&c=N13-TaG7c-EYAiUNohBk74oLRjUiBTwVm-KSnr4bPSc&r=VcRLyVxkyGds34uxiPM944HQvaWq-nynyZXfNpSfhOs&m=qZMqiJ48ZdgXQNJnrLDT8ChNCkk7sQ42nMiHCNHAHu2zOSre0DPgkmi2n_jtKDvD&s=R4TtBNn8t5SrkyFy1ozowPSgquZflYU50Y-F6uixyH0&e=">Bandwidth.com</a>]<o:p></o:p></p>
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<p class="MsoNormal">...And <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.bandwidth.com_blog_abcs-2Dof-2Dattestation-2Dand-2Danalytics_&d=DwMFAg&c=N13-TaG7c-EYAiUNohBk74oLRjUiBTwVm-KSnr4bPSc&r=VcRLyVxkyGds34uxiPM944HQvaWq-nynyZXfNpSfhOs&m=qZMqiJ48ZdgXQNJnrLDT8ChNCkk7sQ42nMiHCNHAHu2zOSre0DPgkmi2n_jtKDvD&s=G7fgN1eoXUXYZw4vwpfoD5Doij6odPvNXwS2PHlZyM0&e=">term
provider 3 is a customer of Bandwidth.com.</a><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Arial Black",sans-serif;color:#18498B">Mark R Lindsey<span class="apple-converted-space"> </span></span></b><b><span style="font-size:13.5pt;font-family:"Arial Black",sans-serif;color:#18498B">|</span></b><span class="apple-converted-space"><b><span style="font-size:7.5pt;font-family:"Arial Black",sans-serif;color:#18498B"> </span></b></span><b><span style="font-size:7.5pt;font-family:"Arial Black",sans-serif;color:#18498B">SMTS </span></b><b><span style="font-size:13.5pt;font-family:"Arial Black",sans-serif;color:#18498B">|</span></b><b><span style="font-size:7.5pt;font-family:"Arial Black",sans-serif;color:#18498B"> +1-229-316-0013 </span></b><b><span style="font-size:13.5pt;font-family:"Arial Black",sans-serif;color:#18498B">|</span></b><b><span style="font-size:7.5pt;font-family:"Arial Black",sans-serif;color:#18498B"> <a href="mailto:mark@ecg.co">mark@ecg.co</a></span></b><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#18498B"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__ecg.co_lindsey_schedule&d=DwMFAg&c=N13-TaG7c-EYAiUNohBk74oLRjUiBTwVm-KSnr4bPSc&r=VcRLyVxkyGds34uxiPM944HQvaWq-nynyZXfNpSfhOs&m=qZMqiJ48ZdgXQNJnrLDT8ChNCkk7sQ42nMiHCNHAHu2zOSre0DPgkmi2n_jtKDvD&s=CBHDNMBQRfN66ebOCNYxTHugStaeRttBIJ0aIgaIuEk&e=">Schedule
a meeting</a> </span><o:p></o:p></p>
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<p class="MsoNormal">On Jul 5, 2022, at 12:19, Zilk, David <<a href="mailto:David.Zilk@cdk.com">David.Zilk@cdk.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">I am getting results from a test to the Bandwidth number that are confusing. It appears that our Identity header is not making it through to them, however the call does have an Identity header, certified by Bandwith, with B attestation.
This is odd as we don't have any direct business relationship with Bandwidth. How can they claim B attestation?<br>
<br>
David Zilk<br>
CDK Global/IP Networked Services<br>
<br>
-----Original Message-----<br>
From: VoiceOps <<a href="mailto:voiceops-bounces@voiceops.org">voiceops-bounces@voiceops.org</a>> On Behalf Of David Frankel<br>
Sent: Sunday, July 3, 2022 8:05 AM<br>
To: <a href="mailto:voiceops@voiceops.org">voiceops@voiceops.org</a><br>
Subject: [EXTERNAL] [VoiceOps] Identity Header Test Tool<br>
<br>
CAUTION: This email originated from outside of the CDK organization. Exercise caution when clicking links or opening attachments, especially from unknown senders.<br>
<br>
Last week I was forwarded a note from this list regarding tools to test and debug SHAKEN Identity headers. That prompted us to stitch together some modules we already had in an attempt to help.<br>
<br>
What we have is at <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__identity.legalcallsonly.org&d=DwMFAg&c=N13-TaG7c-EYAiUNohBk74oLRjUiBTwVm-KSnr4bPSc&r=VcRLyVxkyGds34uxiPM944HQvaWq-nynyZXfNpSfhOs&m=qZMqiJ48ZdgXQNJnrLDT8ChNCkk7sQ42nMiHCNHAHu2zOSre0DPgkmi2n_jtKDvD&s=9EE8xl5gvlIOy3Ck4bTVDx8WWiobc-X72SZEUOtN0o8&e=">
http://identity.legalcallsonly.org</a>. You can call one of the test numbers listed on that page, and if we receive your header, we'll read you a six-digit code. Disconnect and then plug the code into the box on the web form, and we'll show you details of that
Identity header.<br>
<br>
Perhaps most importantly, you'll be able to see if the header we received is the one you sent. In addition, we parse the header and try to tell you if it is correctly formatted and valid.<br>
<br>
Currently we have a couple of geographic DIDs and three toll-free numbers (each using different underlying providers). So far we aren't having a lot of success getting the Identity headers on the TFNs; we're working to improve that.<br>
<br>
Suggestions welcome. We hope the tool provokes more discussion about best practices regarding making the Authentication Framework as functional and useful as possible.<br>
<br>
Happy 4th of July!<br>
<br>
David Frankel<br>
ZipDX LLC<br>
St. George, UT USA<br>
<br>
<br>
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