To add a voicemail to your calls go to Voice from the left navigation.
If you can not see the voice option, then go to your addons and turn voice on.

Adding voicemail to a call-flow

Under voice click the flows section

Create or edit an existing call flow.

On your flow's final step, add a new step and select Voicemail from the options.

Type the greeting you wish to read to the caller or upload your own audio greeting.
Save and you are set!

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