How to create a Data Action that calls an AWS Lambda with IAM auth

Genesys Cloud API & Integrations
1

I design IVRs for multiple clients, and the most creative use of Lambda Data Actions is dynamic menu generation.

Instead of hardcoding IVR menu options in Architect, our Lambda returns the menu structure based on the time of day, caller history, and current queue depth. The IVR literally reconfigures itself in real-time.

2

How do I even connect a Data Action to AWS Lambda? I don’t have AWS experience.

Do I need an AWS account? Is there a cost? I just want my IVR to look up a customer’s account balance from our database. Can someone walk me through the absolute basics?

3

Before connecting to Lambda, verify your network can reach AWS endpoints.

If your GC org is in the US-East region, the Data Action will call Lambda in us-east-1. If you have a restrictive firewall, you need to whitelist the AWS Lambda endpoint IP ranges. Run nslookup lambda.us-east-1.amazonaws.com to verify DNS resolution.

4

We load-tested a Lambda Data Action with JMeter simulating 500 concurrent calls.

The Lambda cold start added 800ms to the first invocation. Subsequent warm invocations averaged 50ms. At 500 concurrent calls, Lambda scaled automatically to 500 concurrent executions with no throttling. The GC Data Action timeout of 10 seconds was never hit.

5

We A/B tested Lambda-powered dynamic routing vs static Architect routing.

Routing Method FCR AHT CSAT
Static Architect 64% 5m 20s 3.9
Lambda Dynamic 73% 4m 40s 4.3

The Lambda function had access to the customer’s full interaction history from DynamoDB, enabling smarter routing decisions than Architect’s native Data Table lookups.

6

To create a Data Action that calls AWS Lambda with IAM authentication:

  • Step 1: Create an AWS IAM user with lambda:InvokeFunction permission.
  • Step 2: In GC, create a Web Services Data Action integration.
  • Step 3: Configure the action with AWS Signature Version 4 authentication.
  • Step 4: Set the request URL to your Lambda’s invoke URL.

Reference: Resource Center article ‘Configuring AWS authentication for Data Actions’.

7

We A/B tested the Lambda Data Action against a direct REST API call to our backend.

Lambda adds a layer of abstraction but provides automatic scaling. The direct REST API was 30ms faster but required us to manage our own auto-scaling group. For contact centers with unpredictable volume spikes, Lambda’s serverless model is the pragmatic choice.