Deepgram

In the EasyCallCenter365 admin portal, go to menu: 
Basic Configuration -> Text to Speech -> Amazon Aws.

Here, you need to modify two parameters: API Key and Server URL.
For users in the United States, you only need to modify the API Key.

For more details about Deepgram, please refer to this page Deepgram Speech-to-Text.
You can log in to the Deepgram dashboard to preview and compare the voices of
different text-to-speech speakers:  https://playground.deepgram.com/