<div dir="ltr"><div class="gmail_quote"><div><br></div><div> </div>While the industry settled on SHAKEN as *the* definitive method for dealing with authentication, it seems that the mobile carriers had different ideas and have implemented their own SPAM control, of which SHAKEN is just one factor. So, ultimately, SHAKEN attestation is just a "suggestion". We have seen this several times and, as stated earlier, submitting the numbers to their whitelists does seem to help -- we haven't had the repeat complaint (yet) of numbers falling off the whitelist. Of course, each carrier has their own.</div><div class="gmail_quote"><br><table class="gmail-wrapped gmail-confluenceTable" style="border-collapse:collapse;margin:0px 0px 0px 60px;overflow-x:auto;color:rgb(23,43,77);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,"Fira Sans","Droid Sans","Helvetica Neue",sans-serif;font-size:14px"><colgroup><col><col></colgroup><tbody style="margin-left:60px"><tr style="margin-left:60px"><td class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px;margin-left:60px"><span style="color:rgb(0,51,102)">AT&T Wireless</span></td><td class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px;margin-left:60px"><span style="color:rgb(0,51,102)"><a href="https://hiyahelp.zendesk.com/hc/en-us/requests/new" class="external-link" rel="nofollow" style="color:rgb(0,51,102)">https://hiyahelp.zendesk.com/hc/en-us/requests/new</a></span></td></tr><tr style="margin-left:60px"><td class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px;margin-left:60px"><span style="color:rgb(0,51,102)">Verizon Wireless</span></td><td class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px;margin-left:60px"><span style="color:rgb(0,51,102)"><a href="https://voicespamfeedback.com/vsf/" class="external-link" rel="nofollow" style="color:rgb(0,51,102)">https://voicespamfeedback.com/vsf/</a></span></td></tr><tr style="margin-left:60px"><td colspan="1" class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px;margin-left:60px"><span style="color:rgb(0,51,102)">T-Mobile</span></td><td colspan="1" class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px;margin-left:60px"><span style="color:rgb(0,51,102)"><a href="https://reportarobocall.com/trf/" class="external-link" rel="nofollow" style="color:rgb(0,51,102)">https://reportarobocall.com/trf/</a></span></td></tr><tr style="margin-left:60px"><td colspan="1" class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px">First Orion, Hiya, TNS</td><td colspan="1" class="gmail-confluenceTd" style="border:1px solid rgb(193,199,208);padding:7px 10px;vertical-align:top;min-width:8px"><a href="https://www.freecallerregistry.com/fcr/" class="external-link" rel="nofollow" style="color:rgb(4,81,161)">https://www.freecallerregistry.com/fcr/</a></td></tr></tbody></table><div> </div></div></div>