Know which numbers answer before you dial
Last reviewed: March 2026
The Line Intelligence API verifies phone numbers by actually calling them. Submit a list of numbers and it calls every one, then reports what happened: a live human, voicemail, or a dead line, plus the carrier and line type for each number. Add a name and answered calls also confirm whether the right person picked up. Every call costs 1,000 credits, and results typically land within 1 to 3 hours.
Features
Real Calls, Real Outcomes
Every number is dialed for real. No carrier-database guesswork: you learn what actually happens when the phone rings.
Full Outcome Taxonomy
Each call resolves to a clear outcome: human, voicemail, disconnected, busy, no answer, blocked, failed, invalid number, or call screening.
Name Verification
Add a name to a number and answered calls also confirm whether that exact person picked up.
Carrier and Line Type
Every result includes the carrier and line type (mobile, landline, VoIP) alongside the call outcome.
1 to 3 Hour Turnaround
Submit a batch and results typically land within 1 to 3 hours, with per-number outcomes as calls complete.
Refunds on Unknown Outcomes
Calls that end without a determinable outcome are refunded. You only pay for answers.
API Endpoints
/ring-enrichmentSubmit a batch of phone numbers to call (1,000 credits per call)/ring-enrichment/{batchId}/progressCheck batch progress and per-outcome distribution/ring-enrichment/{batchId}/resultsRetrieve per-number call outcomes, carrier, and line type/ring-enrichment/{batchId}/csvExport batch results as CSVUse Cases
- List triage before a calling block: dial only the numbers a human actually answers
- Phone data validation: confirm purchased or enriched numbers are live before they enter your CRM
- Identity verification: add names and confirm the right person picks up each number
- Dialer efficiency: strip voicemail-only, disconnected, and blocked lines from outreach lists
- Carrier and line-type routing: separate mobile, landline, and VoIP numbers for SMS versus voice campaigns
- Data vendor audits: measure how much of a purchased phone list actually connects
Pricing
Line Intelligence costs 1,000 credits per call. Calls with unknown outcomes are refunded. Plans: Growth Pack $49/mo (100K credits), Scale Pack $149/mo (500K credits), Pro Pack $499/mo (2.5M credits). 100 free credits included, no credit card required.
Frequently Asked Questions
Each call resolves to one of: human (a person answered), voicemail, disconnected (number out of service), busy, no answer (rang out), blocked, failed, invalid number (not dialable), or call screening (a screening service answered). Calls whose outcome cannot be determined are refunded.
Attach a name to any number you submit. When a call is answered by a human, the result also reports whether that exact person picked up, so you can verify phone ownership, not just line liveness.
Results typically land within 1 to 3 hours of submitting a batch. You can poll the progress endpoint for the live outcome distribution, retrieve per-number results as they complete, and export everything as CSV at the end.
1,000 credits per call. Every result includes the call outcome, carrier, and line type. Calls that end without a determinable outcome are refunded, so you only pay for answers.
Start using the Line Intelligence API
100 free API credits. No credit card required. Get started in minutes with our REST API.