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The response contract — Ecosystem

Glossary

Lambda synchronous timeout At most 8 seconds. The function's own timeout can be longer. The flow still takes the Error or Timeout branch at 8 seconds.
Lambda asynchronous mode The flow continues without waiting. You can wait up to 60 seconds with a Wait block. A sequence of Lambda calls must finish within 20 seconds.
String map A flat object of string keys and string values. One of the two Lambda response shapes.
CloudFormation AWS::Connect::ContactFlow A stack resource whose content is flow-language JSON. Use it to move a flow between instances.

Mind map

Open the Lambda mind map

Sister technologies

Most 'random' flow errors are a Lambda response that missed the timeout or the shape Connect accepts.

Config and troubleshooting

Returning a Python dict with numbers and lists to a string-map block.

Two pieces: a resource policy that trusts connect.amazonaws.com, and an integration association so the flow can select the function. The block still waits at most 8 seconds when InvocationType is SYNCHRONOUS.

Lambda functions IntegrationAssociation

CloudFormation study snippet

Resources:
  InvokePermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !Ref FlowHook
      Action: lambda:InvokeFunction
      Principal: connect.amazonaws.com
      SourceArn: !GetAtt CampusInstance.Arn
  LambdaAssociation:
    Type: AWS::Connect::IntegrationAssociation
    Properties:
      InstanceId: !GetAtt CampusInstance.Id
      IntegrationType: LAMBDA_FUNCTION
      IntegrationArn: !GetAtt FlowHook.Arn

Integration map

Join records on ContactId. The integration map room lists the seams.

Cross-platform bridges

A CUCM calling search space is not a routing profile, but the profile is the closest idea of 'who can receive what'. A partition is not a Connect object. A UCCX CSQ and a UCCE skill group map to a queue. Precision steps map to routing criteria. A script, an Architect flow, and an Avaya vector map to a contact flow.

Open the mapping room

Future hooks

Hooks you can adopt later: EventBridge contact events, the CTR stream, agent events, Kinesis Video, Customer Profiles events, Cases, Show view, data tables, External Tool, and the flow language JSON in your pipeline. Live Sync and Agentic CX are the 2026 hooks for guided and agentic experiences.

Sources and go deeper

Troubleshoot Lambda function failures in Amazon Connect | AWS re:Post community. last checked 2026-10
Flow block in Connect Customer: AWS Lambda function - Amazon Connect Customer AWS docs. last checked 2026-10
What is AWS Lambda? - AWS Lambda AWS docs. last checked 2026-10
AWS Lambda - Wikipedia Wikipedia. last checked 2026-10

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