> ## 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.

# Vobiz – Global SIP Trunking & Voice API Platform

> Vobiz is a developer-first telephony platform with global SIP trunking and voice APIs in 130+ countries - native integrations with Vapi, Retell, ElevenLabs, and pay-per-minute pricing.

## 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.

<CardGroup cols={2}>
  <Card title="Quick Start" icon="bolt" href="/quick-start">
    Make your first call in under 5 minutes.
  </Card>

  <Card title="Build an AI Voice Agent" icon="robot" href="/guides/ai-voice-agent">
    Connect SIP to Vapi, Retell AI, ElevenLabs, or Pipecat.
  </Card>

  <Card title="API Reference" icon="code" href="/account">
    Full REST API documentation - accounts, numbers, calls, recordings, and more.
  </Card>

  <Card title="Error Handling" icon="triangle-exclamation" href="/errors">
    Understand error codes and how to handle them gracefully.
  </Card>
</CardGroup>

## Core APIs

<CardGroup cols={3}>
  <Card title="Account & Balance" icon="user" href="/account">
    Manage your Vobiz account, check balance, and retrieve credentials.
  </Card>

  <Card title="Phone Numbers" icon="phone" href="/account-phone-number">
    List, purchase, and manage DID numbers.
  </Card>

  <Card title="Sub-Accounts" icon="sitemap" href="/sub-accounts">
    Isolate usage and billing per customer or environment.
  </Card>

  <Card title="Call Management" icon="phone-arrow-up-right" href="/call/overview">
    Make, transfer, and control live calls via REST API.
  </Card>

  <Card title="SIP Trunking" icon="server" href="/trunks">
    Provision trunks, credentials, IP ACLs, and origination URIs.
  </Card>

  <Card title="Voice XML" icon="file-code" href="/xml/overview/how-it-works">
    Script call flows with Vobiz XML elements.
  </Card>
</CardGroup>

## Voice AI Integrations

Connect Vobiz SIP trunking with leading AI voice platforms.

<CardGroup cols={4}>
  <Card title="VAPI" icon="plug" href="/integrations/vapi-dashboard">
    Dashboard and API setup for VAPI.
  </Card>

  <Card title="Retell AI" icon="plug" href="/integrations/retellai-dashboard">
    Dashboard and API setup for Retell AI.
  </Card>

  <Card title="ElevenLabs" icon="plug" href="/integrations/elevenlabs-dashboard">
    Dashboard and API setup for ElevenLabs.
  </Card>

  <Card title="LiveKit" icon="plug" href="/integrations/livekit">
    Real-time audio streaming with LiveKit.
  </Card>

  <Card title="Pipecat" icon="plug" href="/integrations/pipecat">
    Python voice AI pipelines with Pipecat.
  </Card>

  <Card title="Bolna.ai" icon="plug" href="/integrations/bolna">
    Conversational AI with Bolna.
  </Card>

  <Card title="Ultravox" icon="plug" href="/integrations/ultravox">
    Low-latency voice AI with Ultravox.
  </Card>

  <Card title="OpenAI Realtime" icon="plug" href="/integrations/openai-realtime">
    OpenAI Realtime API over WebSockets.
  </Card>
</CardGroup>

## Resources

<CardGroup cols={3}>
  <Card title="Core Concepts" icon="book-open" href="/concepts">
    SIP trunking, WebSockets, callbacks, and more.
  </Card>

  <Card title="Best Practices" icon="star" href="/best-practices">
    Number utilization, DLT registration, and capacity planning.
  </Card>

  <Card title="FAQ" icon="circle-question" href="/faq">
    Common questions about concurrency, CPS, integrations, and more.
  </Card>
</CardGroup>

## Frequently Asked Questions

<AccordionGroup>
  <Accordion title="What is Vobiz?">
    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.
  </Accordion>

  <Accordion title="How do I make my first phone call with the Vobiz API?">
    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](/quick-start).
  </Accordion>

  <Accordion title="Which AI voice platforms does Vobiz support?">
    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.
  </Accordion>

  <Accordion title="Does Vobiz work outside India?">
    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.
  </Accordion>

  <Accordion title="What programming languages does Vobiz support?">
    Official SDKs are available for Python, Node.js, Ruby, Go, and C#. The REST API works with any language that can make HTTP requests.
  </Accordion>
</AccordionGroup>