Developer Voice API
Programmatic AI Calling API for Developers & Platforms
Trigger outbound AI calls, stream call audio, and receive live structured transcripts directly in your application via REST APIs and real-time WebSockets.
RESTful API & Webhooks
Trigger outbound phone calls with a single JSON POST payload.
Live Transcript Streaming
Stream live caller audio and LLM reasoning events over WebSockets.
Flat INR Developer Billing
No complex USD billing or unpredictable seat license fees.
Join 100+ Indian Businesses Automating Telecalling
Sub-600ms latency voice agents starting as low as ₹2.00/min. No setup fees, no subscription traps.
Frequently Asked Questions
Make an authenticated HTTP POST request with the destination phone number and agent prompt ID. Vistara handles carrier telephony, LLM orchestration, and returns real-time call results via webhooks.