> ## Documentation Index
> Fetch the complete documentation index at: https://docs-dev.setoo.work/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Call Flow

> How a call moves through transcriber, LLM, and synthesizer

```
Caller ──▶ Telephony Provider ──▶ Transcriber ──▶ LLM ──▶ Synthesizer ──▶ Caller
              (Plivo/Twilio)       (Deepgram)    (GPT-4)   (ElevenLabs)
```

1. **Inbound audio** streams from the telephony provider over WebSocket.
2. The **transcriber** converts audio to text in near real time.
3. The **LLM** receives the transcript plus conversation history and generates a
   response, optionally calling tools.
4. The **synthesizer** converts the response to audio, streamed back to the caller.

Each hop adds latency — see [Latency](/docs/concepts/latency) for how to minimize it.