Make calls

plans-img Available on all plans

deployment-img Cloud and self-hosted deployments

You can join a call or start a call, share your screen, raise your hand, react using emojis during a call, chat in a thread, and continue working in Mattermost while on a call.

Mattermost Enterprise customers can also record calls and transcribe recorded calls.

Mattermost Academy Learn about Mattermost Calls

Note

Mattermost Cloud users can start calling right out of the box. For Mattermost self-hosted deployments, System admins need to enable and configure the plugin using the System Console.

On this page:

Join a call

To join a call, select Join call in a channel, group message, or direct message. Any active team member in a channel or message can join a call, whether it’s a public or private channel, or a group or direct message.

Tip

  • You can share a call’s link to use in a meeting request or share with other people. The link is unique to each channel, and contains the channel’s ID, so it doesn’t change between calls. Use the /call link slash command to generate a shareable link. The call link is valid for long as the channel is active. When a channel is archived or deleted, the share link becomes invalid.

  • If someone from outside of the organization wants to join a call, you need to provide them with a guest account, and add them to the channel. Users who are archived or not registered can’t join a call.

From Mattermost v9.4:

  • You can join the same call using a web browser, the desktop app, and the mobile app. You can mute, unmute, react, share your screen, and configure voice settings independently for each Mattermost client you’re using. You’ll appear multiple times as a call participant in the call widget when you join one call on multiple clients.

  • You’ll see incoming call notifications for direct and group messages when a new call is started. Multiple calls will result in multiple incoming call notifications. If you’re already in a call, and you receive a new incoming call notification, Mattermost prompts you to Join the incoming call, or dismiss the notification.

Start a call

To start a call, select Start call in the channel header. When you start a call in a channel, you’re muted by default. In a direct or group message you’re unmuted by default.

Tip

  • You can move the call widget to a different area of your screen.

  • Alternatively, you can start a call using the /call start slash command.

Share your screen

During a call, you can share your screen with other call participants, unless your system admin has disabled your ability to do so.

Note

Screensharing is available in the Mattermost desktop app or a web browser. The ability to screenshare using the mobile app isn’t supported.

To share your screen:

  1. In the call widget, select Start presenting.

  2. Select the screen you want to share.

  3. To stop sharing, select the Stop presenting icon or the Stop sharing option.

React using emojis

You can use emojis to react during a call.

Expand the call window using the arrows in the top-right of the call widget. From there, select the emoji icon to access frequently-used emojis or select additional emojis from the emoji picker.

Chat in a call

A chat thread is created automatically for every new call.

To do this, expand the call window using the arrows in the top-right of the call widget. From there, select the emoji icon to access frequently-used emojis or select additional emojis from the emoji picker.

Record a call

Note

plans-img-yellow Available only on Enterprise plans

From Mattermost v7.7, if you’re the host of a meeting, you can record the call, unless your system admin has disabled the host’s ability to do so.

Call recordings include audio, any screen sharing during the call, and text captions, when enabled. The default setting for a recording is 60 minutes, but your system admin may change the recording duration as needed. You’ll receive a reminder 10 minutes before the recording limit is reached. If your call is going to continue beyond the recording limit, allow the first recording to complete, then start a new recording immediately after.

When you stop recording, the recording file is posted in the call thread as an MP4 file attachment. It’s available to all users in the channel both during the call, and after the call has ended.

To record a call:

  1. Select Start call in the header of the channel, group message, or direct message.

  2. Select the pop-out icon.

  3. In the call widget, select the Record button.

  4. To stop recording, select the Record button again.

Transcribe recorded calls

Note

plans-img-yellow Available only on Enterprise plans

From Mattermost v9.4, and Mattermost mobile app v.2.13, call recordings can include text captions, and a transcription text file can be generated, unless your system admin has disabled the ability to transcribe call recordings.

Note

Call recording must be enabled to enable recorded call transcriptions.

When call recording stops, the transcription file is posted in the call thread as a TXT file attachment. It’s available to all users in the channel both during the call, and after the call has ended. Additionally, users viewing the call recording can show or hide text captions using the Closed Captioning option in the video player.

Frequently asked questions

Can I set a ring tone for incoming calls?

Yes! From Mattermost v8.0 and Calls v0.17.0, desktop app and web users can go to Settings > Notifications > Desktop Notifications to enable Mattermost to alert you to incoming calls through direct or group messages with a specific ring tone and a desktop notification, unless the system admin has disabled your ability to do so.

Is video supported?

The integration currently supports only voice calling and screen sharing. We’re considering video support in the future.

Can I password-protect a call?

No. Any member with sufficient permission to access the channel can join the call.

Is there encryption?

Media (audio/video) is encrypted using security standards as part of WebRTC. It’s mainly a combination of DTLS and SRTP. It’s not e2e encrypted in the sense that in the current design all media needs to go through Mattermost which acts as a media router and has complete access to it. Media is then encrypted back to the clients so it’s secured during transit. In short: only the participant clients and the Mattermost server have access to unencrypted call data.

Are there any third-party services involved?

The only external service used is Mattermost official STUN server (stun.global.calls.mattermost.com) which is configured as default. This is primarily used to find the public address of the Mattermost server. The only information sent to this service is the IP addresses of clients connecting as no other traffic goes through it. It can be removed in the System Console if you want to provide an ICE Host Override setting instead.

Troubleshooting

My audio doesn’t work when I join a call

If you can hear the other participants in the call but they can’t hear you, select the horizontal dots next to the call end button in the widget. From there, you can check and change your audio output and microphone settings. Select the horizontal dots again to close the menu.

My call is disconnected after a few seconds

This is usually a sign that the underlying UDP channel has not been established and the connection times out after ~10 seconds. When the connection has been established correctly an rtc connected line should appear in the client-side logs (JS console). There isn’t a single solution as it depends on your infrastructure/deployment specifics. However, if you’re a system or network admin, you may need to open up the UDP port or configure the network accordingly.

I can’t screen share using Mattermost desktop on macOS

There’s a known bug on macOS with some versions of Chrome (which is used by Mattermost desktop). If you’ve given screen sharing permissions to Mattermost desktop, and are still unable to screen share, do the following:

  1. Quit Mattermost.

  2. Open Terminal.

  3. In the terminal, run: tccutil reset ScreenCapture Mattermost.Desktop

  4. Restart Mattermost and start a call.

  5. Select Screen share and give it permissions again.

  6. Restart Mattermost again.

If the issue persists please post in the public calls channel.

Debugging

If you experience issues with calls, collecting information is helpful as you can share it with us for debugging purposes.

As with any other issue, but more importantly with calls, it’s very useful to let us know the date and time that the problem occurred, with as much detail as possible so that information can be cross-checked with server logs. Also please include any reproduction steps if applicable. Other important information includes:

  • Browser/app version

  • Operating system type and version

JS console logs

Web app

Browser

Action

Chrome

CMD+OPTION+J (macOS) CTRL+SHIFT+J (Windows, Linux, ChromeOS)

Firefox

CMD+SHIFT+J (macOS)/CTRL+SHIFT+J (Windows, Linux, ChromeOS)

Safari

Enable Developer Menu in Safari > Preferences > Advanced > Show Develop Menu in Menu Bar. Then Develop > Show Javascript Console. Right-click on the console and select Save to file to download the logs.

Desktop app

In the top menu bar of the app, select View > Developer Tools for Current Tab. In the logs that are generated, right-click and select Save as to download the logs.

Mobile app

You can access and share debug logs from Account screen > Settings > Report a problem.

Call stats dump

In cases where there are audio/video issues, difficulty in hearing other participants, and/or stuttering video and/or choppy audio, run the /call stats slash command in the channel where the call is currently active. This returns a JSON object via an ephemeral message.

You can run this command in an active call or after leaving the call in question. However, we will only save data for the last joined call so joining again will delete the previous call’s feedback.

WebRTC internals (Chrome and Firefox only)

This is an additional method for Chrome and Firefox users in cases where there are audio/video issues, difficulty in hearing other participants, and/or stuttering video and/or choppy audio.

Firefox browser

Open about://webrtc in the browser that you’re using for the active call.

Share information

Debug information is helpful to our community as there may be other community members having the same issue as you. We recommend that debug information be shared in either of the two options below:

  • Post in Developers: Calls channel: prefer this method when possible but keep in mind the channel is public.

  • Post in Team: Calls channel: use this channel if posting sensitive information.