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The calls can be encrypted for the public applications. And also, the passwords of the users are encrypted if there is not any user integrations. Hovewer there is not any other encryption because Speech Analytics servers are not in the public network. You can see the attached link of Microsoft:
https://docs.microsoft.com/en-us/sql/relational-databases/security/encryption/sql-server-encryption?view=sql-server-2017

Related Products: Conversational Analytics 2 (Speech&Text&Agent Performance Analytics)