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# AssemblyAI-TTS-1 Protocol & Readback Report (TP-2026-01)

- **Model:** `assemblyai-tts-1` -> Verified via `universal-3-5-pro`
- **Endpoint:** `POST https://tts.us.assemblyai.com/v1/speech/events`
- **X-Request-Id:** `22a468be-3020-4188-8176-3f828e992254`
- **Server-Timing:** `open;dur=17.2, model;dur=52.3, ttfa;dur=69.6`
- **Voice / Language:** `aai-jane` (`english`)
- **Verification Verdict:** **PASS**

## 1. Input Payload Comparison
- **Raw Turn Text:** `[pause] Thanks for calling Alliance Appliance Repair! Your booking code is 493A, confirmed for $12.50 at 2:15 PM.`
- **TurnProof Compiled Text:** `Thanks for calling Alliance Appliance Repair. Your booking code is 4-9-3-A, confirmed for $12.50 at 2:15 PM.`

## 2. Round-Trip Universal-3.5 Pro Transcript
> "Thanks for calling Alliance Appliance Repair. Your booking code is 493A, confirmed for $12.50 at 2:15 PM."

## 3. Finding & Reproducibility Notes
Sanitized prompt stripped [pause] and dashed 4-9-3-A, achieving 100% Universal-3.5 Pro entity readback lock.

// TurnProof Verified Voice Agent Streaming Snippet (TypeScript)
// Verified Run: TP-2026-01 | X-Request-Id: 22a468be-3020-4188-8176-3f828e992254
const response = await fetch("https://tts.us.assemblyai.com/v1/speech/events", {
  method: "POST",
  headers: {
    Authorization: process.env.ASSEMBLYAI_API_KEY!,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    text: "Thanks for calling Alliance Appliance Repair. Your booking code is 4-9-3-A, confirmed for $12.50 at 2:15 PM.",
    voice_id: "aai-jane",
    model: "assemblyai-tts-1",
    language: "english",
    sample_rate: 24000,
    encoding: "pcm_s16le",
    word_boundaries: true,
  }),
});