{
  "slug": "stir-shaken-proves-the-carrier",
  "title": "Caller ID authentication proves the carrier. It says nothing about who is speaking.",
  "summary": "STIR/SHAKEN signs the right to use a number, not the person using it. A cloned voice on a lawfully provisioned line verifies perfectly.",
  "lede": "STIR and SHAKEN did what they were designed to do: they made it hard to put a number on a call that you have no right to use. They were never designed to say anything about the person speaking, and the fraud has moved to exactly that gap. This is a walk through the mechanism, the attestation levels, and the one change that takes authorization off the phone call altogether.",
  "date": "2026-09-29",
  "reading_time": "16 min read",
  "category": "Standards",
  "tags": [
    "STIR/SHAKEN",
    "caller ID",
    "voice deepfake",
    "contact center",
    "call authentication",
    "PASSporT",
    "attestation"
  ],
  "image": "https://cdn.twc.sh/images/igcache/STIR%20SHAKEN%20And%20Voice/1200_630/blog.jpg",
  "url": "/blog/stir-shaken-proves-the-carrier.html",
  "wordcount": 4395,
  "related": [
    "contact-center-voice-deepfake",
    "callback-verification-fails",
    "identity-failure-map"
  ],
  "schema": "Article"
}