I expect Bandwidth is attesting that they know the identity of the SIP trunking 
provider that sent your call to Bandwidth. 

CDK Global -> [term provider 1]  -> [term provider 2, Strips Identity Header] 
-> [term provider 3] -> [Bandwidth.com]

...And term provider 3 is a customer of Bandwidth.com. 
<https://www.bandwidth.com/blog/abcs-of-attestation-and-analytics/>



Mark R Lindsey | SMTS | +1-229-316-0013 | [email protected]
Schedule a meeting <https://ecg.co/lindsey/schedule> 

> On Jul 5, 2022, at 12:19, Zilk, David <[email protected]> wrote:
> 
> 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?
> 
> David Zilk
> CDK Global/IP Networked Services
> 
> -----Original Message-----
> From: VoiceOps <[email protected]> On Behalf Of David Frankel
> Sent: Sunday, July 3, 2022 8:05 AM
> To: [email protected]
> Subject: [EXTERNAL] [VoiceOps] Identity Header Test Tool
> 
> CAUTION: This email originated from outside of the CDK organization. Exercise 
> caution when clicking links or opening attachments, especially from unknown 
> senders.
> 
> 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.
> 
> What we have is at http://identity.legalcallsonly.org. 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.
> 
> 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.
> 
> 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.
> 
> Suggestions welcome. We hope the tool provokes more discussion about best 
> practices regarding making the Authentication Framework as functional and 
> useful as possible.
> 
> Happy 4th of July!
> 
> David Frankel
> ZipDX LLC
> St. George, UT USA
> 
> 
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