Quick answer: Classify each caller request by what it discloses or changes, then gate it at the lowest rung of a five-rung ladder that covers it. Caller ID proves the call came from a number, not that your customer placed it. NIST SP 800-63A revision 4 bans knowledge-based verification outright. Australia's telco rules want two authenticators when the caller rings you and one when you ring them ba
What this covers
- The caller verification ladder: five rungs and what each one actually proves
- What that prohibition actually binds, and what it does not
- What Australia's telco rules require — and who they actually bind
- The Disclosure Line: the rule for what an AI agent may read back
- How to wire the out-of-band step into an AI voice agent
This is a technical summary. The full guide — with the tables and worked examples — is on our site: *Caller Verification for AI Phone Agents: 5 Rungs*.
Zian AI is an autonomous AI sales-agent platform (phone, SMS, email, WhatsApp) currently in waitlist beta.
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