# Overview

Connect Vonyx to your voice-AI platform, framework or PBX.

Every integration needs a Vonyx account with credit, a [number](/docs/console/numbers) and a [SIP trunk](/docs/console/sip-trunks). Then follow your platform's guide.

## Voice-AI platforms

<Cards>
  <Card title="Vapi" href="/docs/integrations/vapi" description="Bring-your-own SIP trunk, dashboard or API." />
  <Card title="Retell AI" href="/docs/integrations/retell" description="Custom telephony with SIP trunking." />
  <Card title="ElevenLabs" href="/docs/integrations/elevenlabs" description="Direct WebSocket, or SIP trunk import." />
  <Card title="Ultravox" href="/docs/integrations/ultravox" description="Outgoing and incoming SIP calls." />
  <Card title="OpenAI Realtime" href="/docs/integrations/openai-realtime" description="Through a LiveKit bridge." />
</Cards>

## Frameworks

<Cards>
  <Card title="LiveKit" href="/docs/integrations/livekit" description="Outbound and inbound SIP trunks for LiveKit Agents." />
  <Card title="Pipecat" href="/docs/integrations/pipecat" description="Pipecat bots over LiveKit SIP." />
</Cards>

## PBX and SIP servers

<Cards>
  <Card title="Asterisk" href="/docs/integrations/asterisk" description="PJSIP trunk and dialplan." />
  <Card title="FreeSWITCH" href="/docs/integrations/freeswitch" description="Gateway on the external profile." />
  <Card title="3CX" href="/docs/integrations/3cx" description="Generic SIP trunk." />
  <Card title="Kamailio" href="/docs/integrations/kamailio" description="Vonyx as an upstream gateway." />
</Cards>

## What works where

| Platform | Connects by | Outbound | Inbound |
| --- | --- | --- | --- |
| Vapi | SIP trunk | Yes | Yes |
| Retell AI | SIP trunk | Yes | Yes |
| ElevenLabs | Call API WebSocket, or SIP trunk | Yes | SIP trunk only |
| Ultravox | SIP | Yes | Yes |
| OpenAI Realtime | LiveKit bridge | Yes | Yes |
| LiveKit | SIP trunk | Yes | Yes |
| Pipecat | LiveKit SIP | Yes | Yes |
| Asterisk, FreeSWITCH, 3CX, Kamailio | SIP trunk | Yes | Yes |

<Callout title="Not available yet">
  DTMF (keypad tones) and call transfer don't work on Vonyx yet, on any platform. Each guide notes which of the platform's features this affects.
</Callout>