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Documentation Index

Fetch the complete documentation index at: https://docs.vobiz.ai/llms.txt

Use this file to discover all available pages before exploring further.

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Welcome to Vobiz

Vobiz is a global programmable telephony platform built for developers. It provides SIP trunking, outbound and inbound voice calls, real-time audio streaming, WhatsApp Business API, and native integrations with AI voice platforms - available in 130+ countries with pay-per-minute pricing and no monthly commitments. What you can build:
  • AI voice agents - connect Vapi, Retell AI, ElevenLabs, LiveKit, Pipecat, Bolna, or Ultravox to real phone numbers over SIP trunking
  • Outbound dialers - make bulk calls to up to 1000 destinations in one API request across any country
  • IVR systems - build interactive menus using Voice XML with DTMF and speech recognition
  • Contact centres - inbound routing, call recording, CDR analytics, and conferencing
  • WhatsApp campaigns - send template, media, and interactive messages via the WhatsApp Business API
Base API URL: https://api.vobiz.ai/api/v1
Authentication: X-Auth-ID + X-Auth-Token headers on every request.

Quick Start

Make your first call in under 5 minutes.

Build an AI Voice Agent

Connect SIP to Vapi, Retell AI, ElevenLabs, or Pipecat.

API Reference

Full REST API documentation - accounts, numbers, calls, recordings, and more.

Error Handling

Understand error codes and how to handle them gracefully.

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Core APIs

Account & Balance

Manage your Vobiz account, check balance, and retrieve credentials.

Phone Numbers

List, purchase, and manage DID numbers.

Sub-Accounts

Isolate usage and billing per customer or environment.

Call Management

Make, transfer, and control live calls via REST API.

SIP Trunking

Provision trunks, credentials, IP ACLs, and origination URIs.

Voice XML

Script call flows with Vobiz XML elements.

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Voice AI Integrations

Connect Vobiz SIP trunking with leading AI voice platforms.

VAPI

Dashboard and API setup for VAPI.

Retell AI

Dashboard and API setup for Retell AI.

ElevenLabs

Dashboard and API setup for ElevenLabs.

LiveKit

Real-time audio streaming with LiveKit.

Pipecat

Python voice AI pipelines with Pipecat.

Bolna.ai

Conversational AI with Bolna.

Ultravox

Low-latency voice AI with Ultravox.

OpenAI Realtime

OpenAI Realtime API over WebSockets.

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Resources

Core Concepts

SIP trunking, WebSockets, callbacks, and more.

Best Practices

Number utilization, DLT registration, and capacity planning.

FAQ

Common questions about concurrency, CPS, integrations, and more.

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Frequently Asked Questions

Vobiz is a global programmable telephony platform for developers - SIP trunking, voice APIs, real-time audio streaming, and WhatsApp Business API available in 130+ countries with pay-per-minute pricing and no monthly commitments.
Sign up at console.vobiz.ai, copy your Auth ID and Auth Token, buy a phone number, then POST to https://api.vobiz.ai/api/v1/Account/{auth_id}/Call/ with from, to, and answer_url. Full steps are in the Quick Start.
Vobiz has native integrations with Vapi, Retell AI, ElevenLabs, LiveKit, Pipecat, Bolna, Ultravox, and OpenAI Realtime. All connect via SIP trunking or bidirectional WebSocket audio streaming.
Yes. Vobiz is available in 130+ countries with local phone numbers, competitive per-minute rates, and low-latency infrastructure worldwide. India-specific features (TRAI compliance, INR billing, GST invoices) are available for Indian accounts.
Official SDKs are available for Python, Node.js, Ruby, Go, and C#. The REST API works with any language that can make HTTP requests.