Application-to-Person Messaging

A2P (Application-to-Person) Messaging refers to SMS messages sent from a business application to individual consumers. Examples include appointment reminders, authentication codes, and marketing messages. A2P messaging requires registration (10DLC) to ensure deliverability.

A2P vs P2P

  • A2P — Business-to-consumer, often automated
  • P2P — Person-to-person, conversational

Carriers filter A2P differently than P2P, requiring proper registration.

A2P Registration

Since 2021, US carriers require A2P messages to be registered through 10DLC (long codes) or use short codes/toll-free for better throughput.

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