Automate toll-free number registrations at scale with AWS End User Messaging

This article describes a serverless architecture for automating toll-free number (TFN) registrations at scale using AWS End User Messaging SMS.

• Uses AWS Step Functions to orchestrate seven API calls required for each TFN registration submission
• Leverages Amazon EventBridge to capture async carrier review status callbacks without polling
• Implements human-in-the-loop pattern for handling registration rejections with SNS notifications
• Stores registration state in DynamoDB and uses presigned S3 URLs for opt-in workflow uploads
• Reduces manual console work from minutes per registration to a single API call
• Applies to International Toll-Free Numbers (ITFNs) by adjusting registration type and country code
• Includes DryRun mode for testing without incurring phone number charges
• Provides cost-efficient waiting during 1-15 business day carrier review using task tokens

The solution automates the full TFN registration lifecycle from submission through carrier review and resolution, eliminating operational bottlenecks for ISVs, SaaS providers, and large organizations managing hundreds of registrations.