Microsoft Teams Casting and Companion Mode

Do you take your laptop or mobile into a meeting in a Teams Meeting Room? If you do this blog is for you.


If you have you device with you and simply want to share something, there is no longer any need to connect your laptop to the meeting room system. The cast feature uses bluetooth to locate the meeting room, so both the companion device and meeting room need bluetooth enabled for this to work. First choose Cast from the … menu

Teams Desktop … Menu with Cast option highlighted

Then wait for your device to locate the meeting room and select the room and click Next

Teams room selector showing only one available room, which is ticked

Select the content you wish to share and select Cast

Cast Window showing available sources from local machine

Your device will automatically join the meeting in ‘companion’ mode, with the camera, speaker and microphone off, and share the content.

Microsoft Teams on Desktop showing meeting screen with content shared with the sound and camera off.

The meeting room screen will show the shared content.

Meeting room showing shared content and virtual attendee.

Companion Mode

Companion mode (not its official name) is where you join a meeting but select the meeting room as the audio device. Note this is different to joining the meeting as yourself from a second device, here we are joining as ourselves but with audio disabled. For more information on joining as yourself from two or more devices see the guide for joining a Teams meeting on a second device from the Desktop or Mobile.

To join using room audio from a mobile device, open the meeting from your calendar and select Join. The Teams meeting should detect the room audio if the meeting is already in progress and default to that option.

Join meeting screen with meeting room audio selected

If you join from a meeting reminder, you will see the following screen, if the meeting is already in progress in the meeting room and should choose Add this device.

Meeting join choices screen on iOS with Add this device option highlighted

Once you are in the meeting, you can use the chat, reactions etc.

Meeting menu on iOS device

If the meeting has not started on the meeting room device, you can still join the meeting from your device and choose the room audio, by selecting the arrow on the Join Now button and choosing Join & add room.

Meeting join screen with join and add room audio option highlighted

Nearby rooms should appear automatically or you can search. Select required room and choose Join

Meeting room search screen with nearby rooms showing

As the meeting had not started you will now also see the option to open meeting room controls.

Control room system screen with Control button to open controls

The meeting room controls allow you to control video and audio as well as select display layouts such as Front Row or Gallery.

Meeting room control panel with volume, video, mute, captions and layout options

Should you with to join a meeting from a laptop or Mac then you should select the room audio on the join screen to join in companion mode.

Desktop meeting join screen with room audio option selected

Once you join the meeting from your desktop, you will see the camera is off and the mute button is replaced with a different icon to indicate all sound is disabled on the device.

Meeting tool bar in companion mode on desktop client with camera off and audio disabled

Published by sfennah

I am a freelance learning professional with over 22 years’ experience including holding 30+ Microsoft certifications and Microsoft Certified Trainer status since 2008.

3 thoughts on “Microsoft Teams Casting and Companion Mode

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: