+-------------+     +-----+     +-----------+     +-------+     +----------+     +-----+     +-------------+
| Caller      |---->| VAD |---->| STT       |---->| LLM   |---->| Response |---->| TTS |---->| Agent Audio |
| Audio       |     |     |     | (speech   |     | (text  |     | Text     |     |     |     | (to caller) |
| (from mic)  |     |     |     |  to text) |     |  gen)  |     |          |     |     |     |             |
+-------------+     +-----+     +-----------+     +---+---+     +----------+     +-----+     +-------------+
                                                      |
                                                      | function call?
                                                      v
                                              +----------------+
                                              | HTTP endpoint  |
                                              | (your API)     |
                                              +-------+--------+
                                                      |
                                                      | result fed back to LLM
                                                      v
                                              +----------------+
                                              | Webhooks       |
                                              | (pre/post call)|
                                              +----------------+

{
  "system_prompt": "You are a helpful customer service agent...",
  "first_message": "Hello! How can I help you today?",
  "stt_provider": "assemblyai",
  "voice_id": "uuid-of-resemble-voice",
  "functions": [...],
  "webhooks": {
    "pre_call": "https://example.com/pre-call",
    "post_call": "https://example.com/post-call"
  }
}