Record a voicemail greeting in Teams

From your computer

1. Click the "..." in the upper right corner of the Teams window, then select Settings.
2. Navigate to Calls and then click Configure voicemail. 
   

Configure voicemail options

Record a greeting

1. Click Record a greeting. A new call window will appear. If it's not already showing, click to show the keypad.
2. Press 2 to listen to your recordings, then do one of the following:
   1. Press 1 to listen to your message.
   2. Press 2 to re-record your message.
3. Follow the prompts to start recording, listen to your recording, and save your greeting.

Text-to-speech greeting

You can simply input text and a fairly decent robot voice will read it for you (if you've recorded a greeting, the recording will take precedence over the text-to-speech option). You can input different text for a regular greeting and a greeting that changes when you enable automatic replies in Outlook.

Note: The text-to-speech greeting is limited to 750 character max.

From a mobile device

1. Sign into the Teams mobile app. 
2. Tap the menu icon at the top left (fun fact: it's called a hamburger menu). 
3. Tap Settings.
4. Tap Calling.
5. Tap Change voicemail greetings - it will then call your voicemail and you can follow the prompts to set it up or change your greeting.

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Related:

Record a voicemail greeting for a different account in Teams