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Contact Center uses Microsoft Azure Cognitive Services to provide sentiment for calls. Specifically, Contact center leverages two Azure services to provide sentiment, Speech and Text Analytics. As part of the Contact Center trial, 1000 API calls will be provided per tenant. To continue using the sentiment feature, both Azure services will need to be setup in your Azure tenant and the API Keys entered into the correct field in Contact Center.
Note: Microsoft Azure Cognitive Services are a billable service and enabling this will be a cost to your Microsoft Tenant. Be aware of the billing charges that will result.