[OT] Questions on 1M$ fine in recent Stir/Shaken violation

Hello,

I’ve just read this [1] article.
My understanding of the case is that Lingo Telecom attested with an A-level some outbound calls sent by Life Corporation through a Lingo Telecom-provided SIP trunk, though these calls were not using any DID provided by Lingo Telecom to Life Corporation.

My questions are:

  1. Did the calls use some legitimate DID provided to Life Corporation by an other telephony provider or did they use some random DID not provided to Life Corporation at all ?
  2. What attestation level should have been used by Lingo Telecom, in the first place ? B or C ?

[1] Telco fined $1M for transmitting Biden deepfake without verifying Caller ID | Ars Technica

Best regards

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