# Troubleshooting Guide for PTZ Cameras

The PTZ cameras uses Web Real-Time Communications ([WebRTC](https://webrtc.org/)) to achieve ultra-low latency for both streaming and camera controls, from anywhere in the world. The expected latency should be around 0.5 seconds when the camera has properly established a WebRTC connection. However, there are some instances where the WebRTC connection might fail due to networking issues or firewall configurations.

Use this article to learn how to achieve the best performance and lowest latency for PTZ cameras through the use of WebRTC.

***

## Common questions

### How do I know if WebRTC is not working?

If you are experiencing a latency of around \~2 seconds, WebRTC has most likely failed. You will be able to easily determine this by looking at the video feed’s layover UI in Command. If you notice an orange exclamation mark (see image below) at the top of the camera’s video feed, this indicates that the camera was unable to establish a WebRTC connection.

<div align="left" data-with-frame="true"><img src="/files/WhPdg7FDRjvjYgzW24ao" alt=""></div>

### What are the recommended domains to use?

Verkada devices need to communicate with specific domains to provide you with a full-featured experience. The following domains must be accessible by the camera in order to establish a WebRTC connection:

```
*.control.verkada.com - TCP+UDP/443
*.verkada.com - TCP+UDP/443
time.control.verkada.com - UDP/123
*:4100 - TCP/UDP on LAN (only required for local streaming)
*.kinesisvideo.us-west-2.amazonaws.com - TCP/443
*.kinesisvideo.us-west-2.amazonaws.com - UDP/443
```

{% hint style="warning" %}
See [Camera Network Settings](/verkada-cameras/configuration/camera-network-settings.md) for more information.
{% endhint %}

#### Video resolution

|                                                                                |                       |                                                                                                                                                                 |
| ------------------------------------------------------------------------------ | --------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Model**                                                                      | **Sensor Resolution** | **Streaming Settings**                                                                                                                                          |
| [CP52-E](https://docs.verkada.com/docs/video-security-ptz-series-overview.pdf) | 5MP (2688 x 1944)     | <p><strong>Static PTZ</strong>: 600–2500 Kbps</p><p><strong>User-controlled PTZ</strong>: 2000–4500 Kbps</p><p><strong>Sentry Mode</strong>: 1500–4000 Kbps</p> |
| [CP63-E](https://docs.verkada.com/docs/video-security-cp63-e-datasheet.pdf)    | 4K (3840 x 2160)      | <p><strong>Static PTZ</strong>: 600–3000 Kbps</p><p><strong>User-controlled PTZ</strong>: 2500–5000 Kbps</p><p><strong>Sentry Mode</strong>: 1500–5000 Kbps</p> |

### What if I still cannot establish a low-latency WebRTC connection?

If your network is configured properly as per the instructions above, and you still cannot establish a low-latency WebRTC connection:

{% stepper %}
{% step %}
**Contact** [**Verkada Support**](https://www.verkada.com/support/)**.**
{% endstep %}

{% step %}
**Use the** [**Network Troubleshooting - Internet Sharing guide**](/verkada-cameras/maintenance-and-troubleshooting/troubleshooting/network-troubleshooting-internet-sharing.md) **to provide a packet capture to the team so we can best solve your issue.**
{% endstep %}
{% endstepper %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.verkada.com/verkada-cameras/maintenance-and-troubleshooting/troubleshooting/troubleshooting-guide-for-ptz-cameras.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.