This application provides a set of Lambda functions, which are available within your Amazon Connect instance after provisioning the instance with your Service Cloud Voice contact center. You can use these Lambdas in Amazon Connect contact flows.
AWS Serverless Application Repository: https://serverlessrepo.aws.amazon.com/applications/us-east-1/317368162107/ServiceCloudVoiceLambdas
Read Service Cloud Voice Implementation Guide: https://developer.salesforce.com/docs/atlas.en-us.voice_developer_guide.meta/voice_developer_guide/voice_intro.htm