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Application-to-Person Messaging


Application-to-Person messaging (A2P) is any kind of message traffic in which a person is receiving messages from an application rather than another individual, and which is not expected to receive a reply. A2P message includes, but is not limited to, marketing communications, appointment reminders, chatbots, notifications, and one-time passwords (OTPs) or PIN codes.

Carriers in the US and Canada have a strict interpretation of A2P, and consider all messaging that passes through Twilio — or other messaging application platforms — to be A2P.


Examples of A2P messaging

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Wireless carriers treat P2P and A2P traffic differently in terms of the type and volume of traffic that they allow. It is important to understand your use case so you can use the correct tools, such as phone numbers(link takes you to an external page), short codes, or Alphanumeric Sender ID(link takes you to an external page).

Learn more about the difference between A2P and P2P SMS(link takes you to an external page).


'US A2P 10DLC' is a system in the US that allows businesses to send A2P messages via standard 10-digit long code (10DLC) phone numbers.

'A2P 10DLC' is also the new standard for businesses to send trusted messages in the US and to minimize unwanted messages. Businesses register their brands and campaigns with mobile carriers. In return, the carriers provide them with high-volume, high-deliverability messaging.

For more detailed information on A2P 10DLC in the US, the registration process, fees, and benefits, please see What is A2P 10DLC?(link takes you to an external page)


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