> For the complete documentation index, see [llms.txt](https://docs.nexthink.com/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nexthink.com/platform/ja/user-guide/collaboration-experience/call-quality-nql-capabilities.md).

# 通話品質の NQL 機能

[Investigations](/platform/ja/user-guide/investigations.md) を通じて、[NQL データモデル](/platform/ja/understanding-key-data-platform-concepts/nql-data-model.md) の `collaboration.sessions` テーブルを使用し、コラボレーションデータにアクセスします。

### 通話品質データの調査とクエリ <a href="#gettingstartedwithcollaborationexperience-theinvestigationsmodule" id="gettingstartedwithcollaborationexperience-theinvestigationsmodule"></a>

統合された `call.quality` 指標を使用して、音声、ビデオ、画面共有の品質や、通話に影響する接続問題など複数の要因を組み合わせ、通話全体の品質を評価します。

{% code overflow="wrap" lineNumbers="true" %}

```
collaboration.sessions past 24h
| summarize poor_qualitycalls=countif(call.quality=poor)by device.name
| list device.name, poor_qualitycalls
| sort poor_qualitycalls desc 
```

{% endcode %}

### MS Teams Rooms の通話を特定する

会議室で行われた通話は、NQL フィールド `collaboration.session.participant_device.type` からアクセスできるデバイスタイプ **room\_system** を使って容易に識別できます。

Microsoft Teams Rooms を搭載したデバイスを取得するには、次のクエリを使用します:

{% code overflow="wrap" lineNumbers="true" %}

```
devices 
| with collection.sessions 
| where participant_device.type = room_system or device.meeting_room_name != null
```

{% endcode %}


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