Quick Answer (TL;DR):
An Automatic Telephone Dialing System (ATDS) or autodialer is telecommunications equipment that possesses the capacity to store or produce telephone numbers using a random or sequential number generator, and to dial those numbers automatically.
The Statutory & Case Law Context:
Under 47 U.S.C. ยง 227(a)(1), autodialers are subject to strict consent requirements. In the landmark decision Facebook, Inc. v. Duguid (2021), the U.S. Supreme Court narrowed the federal definition, ruling that to qualify as an ATDS, equipment must employ a random or sequential number generator.
Operational Implication:
- State Mini-TCPA Risks: While standard CRM click-to-dial systems may fall outside the federal ATDS definition, several states (e.g., Florida, Oklahoma, Washington) enforce broader definitions of automated dialing that regulate systems dialing from fixed lists.
- Prerecorded Messages: The TCPA strictly restricts artificial or AI voice messages regardless of whether an ATDS was used.
- Architecture Audits: Maintain engineering documentation detailing how your dialer stores, retrieves, and places calls without random or sequential number generation.
Related Guide:
Learn dialing technology standards in our TCPA compliance checklist for outbound campaigns (2026 update) and through our TCPA Compliance Consulting services.