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

本文介绍音视频通话过程中下行事件返回的错误码及其解决方案。

<!-- @cols-width: 100,269,471 -->
| | | | \
|**code** |**msg** |**说明** |
|---|---|---|
| | | | \
|4027 |Your account has an overdue payment, please recharge immediately. |* 原因：账户欠费。 |\
| | |* 解决方案：请检查[账户余额](https://console.volcengine.com/coze-pro/overview)。 |
| | | | \
|4028 |Insufficient coze credits balance, please wait for the quota refresh or upgrade to paid version. |* 原因：免费版资源点不足。 |\
| | |* 解决方案：请检查[账户余额](https://console.volcengine.com/coze-pro/overview)。 |
| | | | \
|4029 |The connection was closed due to prolonged user inactivity. Please retry your request. |* 原因: 房间长时间没有对话，自动退出。 |\
| | |* 解决方案:  通过[Realtime 上行事件](/developer_guides/signaling_uplink_event)修改 longest_silence_ms 提高房间的静默时间（默认 3 分钟）。退出房间后需要重新创建房间。 |