STIR/SHAKEN Robocall Authentication Creates False Positives That Silently Block Legitimate Medical, Pharmacy, and Emergency Callback Calls

Carrier-level robocall blocking systems using STIR/SHAKEN attestation and analytics engines silently drop or label legitimate calls as spam, particularly from healthcare providers, pharmacies, schools, and small businesses whose calling patterns (high volume, short duration, varied recipient numbers) resemble robocall signatures. So what? Patients miss specialist referral calls, prescription-ready notifications, and lab result callbacks, causing delays in time-sensitive medical care. So what? Unlike email spam filters where blocked messages go to a spam folder the user can check, blocked phone calls simply never ring and leave no trace, so the recipient never knows the call existed. So what? Legitimate callers have no reliable way to know their calls are being blocked because carrier blocking decisions are opaque and vary by recipient carrier. So what? The only remediation path is for callers to register with each carrier's analytics vendor individually (TNS, Hiya, First Orion, etc.), a fragmented process with no single registry or guaranteed result. So what? The FCC's 2025 call blocking rules expanded carrier authority to block calls at the network level without subscriber consent, further increasing silent false positive risk with no mandated transparency reporting on false positive rates. The structural root cause is that robocall blocking systems optimize for minimizing spam complaints (false negatives) with no corresponding penalty or even measurement of false positives, creating a one-sided optimization that treats legitimate callers as acceptable collateral damage.