Voice API
Add voice to your product with one API
Place and receive calls, build IVR and call flows, record and transcribe, and connect AI agents — all from a single REST API, backed by our own carrier-grade network in 220+ countries.
Caller
+1 202 555 0142
Routed to
Sales team
Handling 2.5 million calls daily for 300+ companies
API Resources
One API, every resource you need
Beyond calls: manage everything your integration needs, from scenarios to phone numbers, in the same REST API.
Actions scenarios
Create, update, and run Callr Actions scenarios — the call flows that power every phone number.
API Reference →Audio files
Upload, convert, and manage the prompts and hold music your scenarios play.
API Reference →Recordings
Search, fetch, and delete call recordings, with transcripts and AI analysis attached.
API Reference →End users
Model the people and companies behind your numbers, for compliance and billing.
API Reference →Phone numbers & store
Search your numbers, or reserve and buy new ones — geographic, mobile, or toll-free — in 220+ countries.
API Reference →SMS
Send and search SMS messages, with delivery status and cost on every message.
API Reference →Tasks
Track the status of long-running operations, like bulk exports, through to completion.
API Reference →Webhooks
Subscribe to real-time events — calls, SMS, recordings, billing — with HMAC-signed payloads.
API Reference →Callr Actions
Build call flows in minutes, not sprints
Describe your call flow as a simple YAML scenario — greet the caller, route, record, and hand off to AI — then ship it. Test everything in Build Mode before you go live.
- Declarative YAML scenarios
- Test in Build Mode before production
- Version, branch, and reuse flows
Developer-first
A REST API built for developers
Clean, well-documented REST endpoints and webhooks for everything — so voice fits the stack you already have.
REST API & webhooks
Trigger calls from your backend and get real-time webhook events — call started, answered, ended, recording ready — pushed straight to your endpoints.
Complete call detail records
Every call returns a full CDR — source, duration, recording, and cost — ready for your analytics and billing.
Built on the OpenAPI 3.1 specification. View the spec
Infrastructure
We own our network
Global coverage
220+ countries, with local, premium, and toll-free numbers.
Encrypted & secure
Every call stays private — encrypted with HTTPS, SIP TLS, and SRTP.
Reliable network
Multiple data centers worldwide with carrier-grade redundancy.
Registered carrier
Our own network delivers the performance and number localization a reseller can’t.
Built on by teams that run on calls
“Call tracking has grown our brand awareness and built real trust with our clients.”
Dassin Bidouzo
Chief Digital Officer, Bien’Ici
“We’ve worked with Callr from the beginning and grown together. Their responsiveness and an API that keeps evolving make all the difference.”
Yannick Fauchille
Co-founder & Business Lead
“We prove ROI to our clients easily, without digging through data sources by hand.”
Julien Balmont
Co-founder & CTO, Zenchef
Ready to build with voice?
Create a free account and place your first calls in minutes — or see what teams build on Callr.