VOICE API
Build custom call flows with simple HTTP callbacks, on infrastructure built for AI voice. No state machines, no proprietary SDKs, nothing to manage. Carrier-grade reliability from day one.
CORE PLATFORM
Custom call flows via HTTP callbacks
Serverless architecture. Define call logic with simple HTTP endpoints. No state machines, no proprietary SDKs. Your code, your language, your infrastructure.
SIP trunking and registration
Bring your own infrastructure or use ours. Standards-based SIP with elastic capacity. No per-channel commitments.
Instant phone number provisioning
Local and toll-free numbers in 150+ countries. Provision via API in seconds. Port existing numbers with zero downtime.
Conferencing, transfer, and advanced call control
Multi-party conferencing, warm/cold transfer, hold, mute, DTMF collection. Full call control via REST API or real-time webhooks.
Batch voice messaging
Automated outbound calling at scale for notifications, reminders, and alerts. Reach thousands in minutes, not hours.
STIR/SHAKEN and caller ID
BYO STIR/SHAKEN credentials. Branded caller ID for higher answer rates and trust. Stop your calls from showing as spam.
VOICE INTELLIGENCE
Call recording
Start, stop, pause, and resume programmatically. Download via API. PCI-compliant pause/resume for payment flows.
Real-time transcription
Live transcription on active calls. Power AI assistants, real-time agent coaching, and compliance monitoring.
Speech recognition
DTMF alternative for natural language IVR. Collect spoken input without forcing callers through touch-tone menus.
Media streaming
Real-time audio via WebSocket. Build custom speech analytics, voice biometrics, or AI integrations on the live audio stream.
Voicemail detection
Automatically detect answering machines and voicemail. Route to a message or retry — don’t waste agent time on dead air.
HOW IT WORKS
1
Provision a number
Pick a local or toll-free number from 150+ countries. It’s live in seconds.
2
Define your call flow
Point incoming calls at your HTTP endpoint. Return JSON to control the call — play audio, collect input, transfer, record.
3
Handle callbacks
We send events to your server as the call progresses. React in real time — no polling, no WebSockets to manage.
4
Go live
Scale from one call to one million. Same API, same reliability, same carrier-grade infrastructure.
USE CASES
Emergency notifications
Mass outbound calling for critical alerts and time-sensitive notifications.
Cloud contact center
Build a fully custom contact center with intelligent routing, recording, and real-time analytics.
Cloud PBX
Replace legacy phone systems with a programmable, API-driven PBX.
Click-to-call
Embed voice calling directly into your web or mobile app.
AI voice assistants
Power conversational AI agents with real-time transcription and call control.
Appointment reminders
Automated outbound calls with confirmation collection via DTMF or speech.
100B+
Calls connected
150+
Countries
99.9999%
Call completion rate
SOC 2 Type II
Independently audited
HIPAA/HITECH
Independently assessed
Carrier-grade infrastructure trusted by enterprises that depend on voice.
Pay-as-you-go pricing. No contracts. No minimums. Scale up or down as your traffic demands.
Enterprise voice infrastructure for testing, monitoring, and building.
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