# AI建议在美国的医疗紧急情况下发短信给911，忽略了正确的无障碍选项是TTY/TDD和实时文本

- **ID:** `emergency/ai-suggests-texting-911-when-disabled`
- **领域:** emergency
- **类别:** life_safety
- **错误码:** `E911-ACCESS-ERR-001`
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

AI错误地认为发短信给911是普遍可用且无障碍的，而实际上美国许多公共安全应答点（PSAP）不支持紧急短信；FCC规定TTY/TDD和实时文本（RTT）是聋哑/听障人士的标准无障碍通道。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| FCC RTT Mandate 2023 | active | — | — |
| NG911 Phase 1 | active | — | — |
| iOS 17 RTT | active | — | — |
| Android 14 RTT | active | — | — |

## 解决方案

1. ```
   Use the built-in RTT (Real-Time Text) feature on iOS: Settings > Accessibility > RTT > enable 'Software RTT' and dial 911. On Android: Phone app > Settings > Accessibility > RTT > select 'Visible during call' and dial 911.
   ```
2. ```
   If RTT is not available, use TTY/TDD by connecting a TTY device via the headphone jack, or use the TTY software mode on iPhone (Settings > Phone > TTY).
   ```
3. ```
   Register for local PSAP SMS-to-911 support by checking with your carrier and local emergency management office; keep a backup plan like a pre-written script for a hearing person to call on your behalf.
   ```

## 无效尝试

- **Advise user to enable 'Text to 911' in phone settings** — Not all carriers or regions support SMS-to-911; enabling the setting does not guarantee delivery to the correct PSAP. (70% 失败率)
- **Suggest using a third-party relay service app for emergency texting** — Third-party apps may have latency or routing issues; official RTT is built into the OS dialer and should be used instead. (85% 失败率)
- **Tell user to call 911 and then switch to text if unable to speak** — If the user cannot speak due to disability, calling first may be impossible; RTT allows simultaneous voice and text. (60% 失败率)