Beyond Compliance: Why STIR/SHAKEN Level A Attestation Is Just the Beginning

STIR/SHAKEN authentication is increasingly mandatory for VoIP compliance, but it's widely misunderstood as a complete anti-spam solution. The actual decision to block or flag calls comes from carrier analytics engines (T-Mobile Scam Shield, AT&T ActiveArmor, Verizon Call Filter), not STIR/SHAKEN itself. Call centers that stop at basic attestation without mastering carrier reputation management face dramatic call deliverability declines, making a comprehensive understanding of multi-layer compliance essential for 2026.