A single API call resolves to a healthy, geographically-relevant DID — falling back gracefully instead of failing, and feeding usage data straight back into reputation scoring.
Nothing about number selection is a coin flip — each tier is a deliberate trade-off between relevance and availability.
Highest answer-rate match — a local number for a local destination.
Falls back to any healthy number in-state if the exact area code is exhausted.
Local access and transport area — a step wider, still regionally relevant.
Carrier-defined regional grouping, used when state-level pools run thin.
Best health score first, regardless of geography.
Least-recently-used, ignoring health — keeps calls flowing under load.
Any active number at all. This tier cannot return empty if you own a number.
Answer rate, spam complaints, carrier rejections and AMD results all feed one composite score per number. Numbers that slip below threshold rotate out automatically — before they cost you deliverability.
Once your account clears KYC, routing is a single authenticated request — the cascade logic runs entirely on our side.
API access, routing profiles and number pools are provisioned right after approval.