Call Automation Bug Reproduction

This repository contains a minimal sample to reproduce a bug in Azure Communication Services Call Automation where an error occurs when trying to play a prompt after a call transfer fails.

Setup

1. Clone this repository
2. Run npm install
3. Copy .env.example to .env and fill in the required values:

   PORT=8080                         # Local server port
   CONNECTION_STRING=                # ACS resource connection string
   CALLBACK_URI=                     # Your callback URL (e.g. from ngrok, dev tunnel, etc.)
   COGNITIVE_SERVICE_ENDPOINT=       # Azure AI service endpoint
   ACS_RESOURCE_PHONE_NUMBER=        # Your ACS phone number
   AGENT_PHONE_NUMBER=               # Target phone number for transfer
   

4. Start the server with npm run dev

Bug Description

When attempting to play a prompt after a call transfer fails, an error occurs in the Call Automation service.

Steps to Reproduce

1. Make a POST request to initiate the outbound call:

   POST http://localhost:8080/api/outboundCall
     Content-Type: application/json
   
   {
     "phoneNumber": "+1234567890"  // The phone number to call
   }
   

2. Wait for the transfer attempt
3. After transfer fails, the service attempts to play a prompt
4. Error occurs at this point

You can use tools like Postman, curl, or any HTTP client to make the POST request.

Example using curl:

curl -X POST http://localhost:8080/api/outboundCall \
  -H "Content-Type: application/json" \
  -d '{"phoneNumber": "+1234567890"}'