Cortana voice assistance in Microsoft Teams Rooms lets users have a hands-free experience for joining or ending a meeting, adding someone to a meeting, or calling a number from your conference room. Users can interact with Cortana by either utilizing Push to Talk (Cortana Icon) or Keyword Spotting (Hands Free).
Tips:
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You can say "Cortana" or "Hey Cortana" to start a command. Both will work fine.
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You can also say "cancel" or "never mind" if you want to cancel a command or start over.
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Say "Cortana help" for a list of ways Cortana can help.
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For more information about Cortana, visit Cortana in Microsoft 365.
Invoke Cortana in Microsoft Teams Rooms
Push to talk (Cortana icon)
Instead of actively listening for the keyword, Cortana is only enabled when you select the Cortana icon in the bottom left corner of the screen. Once you complete your command, the microphone is turned off and will only turn on again when you select the Cortana icon.
The Cortana Icon button is highlighted in yellow in the image below.
Keyword spotting (Hands free)
When enabled, keyword spotting allows the user a hands-free experience. Instead of selecting the Cortana button, simply invoke Cortana by saying the keyword “Cortana” or “Hey Cortana.” The keyword will activate the microphone so you can ask Cortana a question or say a command such as, “start my meeting.” When you're done talking, Cortana will go back into active listening mode and will only be invoked again when you say the keyword.
To turn on voice activation, Go to More 
in your Microsoft Teams Rooms console and turn the Cortana toggle On.
Join or end a Microsoft Teams Rooms meeting
To join a Teams meeting from Microsoft Teams Rooms using Cortana, say, "Cortana, join my meeting."
When you’re finished with the meeting, you can say “Cortana, end my meeting.”
Add someone to a Microsoft Teams Rooms meeting
To add a number to a meeting, you can say, "Cortana, add 555-222-3333 to my meeting.” To add a contact, just say, "Cortana, add Babek to my meeting.”
Make a call from a Microsoft Teams Rooms device
To make a touchless call in Microsoft Teams Rooms, you can say, “Cortana, call 555-222-3333.” or “Cortana, call Babek.”
When you’re finished with the call, you can say, “Cortana, end the call.”
