MULTI-CARRIER ROUTING · 7-TIER FAILOVER · COMPLIANCE-GATED ACCESS
KYC REVIEW SLA < 24H
Platform

Every call gets a number. Every number gets watched.

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.

NXLVL routing engine — illustrative visualization
Routing

Seven tiers, cascading in order.

Nothing about number selection is a coin flip — each tier is a deliberate trade-off between relevance and availability.

01

Same area code

Highest answer-rate match — a local number for a local destination.

02

Same state

Falls back to any healthy number in-state if the exact area code is exhausted.

03

Same LATA

Local access and transport area — a step wider, still regionally relevant.

04

Same rate center

Carrier-defined regional grouping, used when state-level pools run thin.

05

Any healthy number

Best health score first, regardless of geography.

06

Any number under limit

Least-recently-used, ignoring health — keeps calls flowing under load.

07

Absolute fallback

Any active number at all. This tier cannot return empty if you own a number.

Monitoring

Health scores update on every call, not on a schedule.

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.

Illustrative example
+1 (512) 555-01XX
96
+1 (214) 555-02XX
81
+1 (312) 555-03XX
64
+1 (917) 555-04XX
38
Integration

One endpoint, resolved server-side.

Once your account clears KYC, routing is a single authenticated request — the cascade logic runs entirely on our side.

# Request a DID for an outbound destination GET https://api.nxlvl.us/did/route?n=15125550123 Authorization: Bearer nxlvl_live_•••••••••• # Response — plain text, ready to dial from 15125559876 X-NXLVL-Tier: 1
See it on your account

Start with KYC — the platform follows.

API access, routing profiles and number pools are provisioned right after approval.