Enterprise MM4 MO icon

Enterprise MM4 MO

1.0.x
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Overview

The MM4 MO Message Callback API enables seamless integration between AT&T’s AAMG (AT&T Aggregator Messaging Gateway) platform and messaging aggregators. This interface is designed to deliver inbound MMS (Multimedia Messaging Service) messages from AT&T’s network to aggregator platforms in a standardized, automated fashion.

Aggregators receive notifications of new inbound MMS messages sent from AT&T subscribers through a secure, versioned callback endpoint. Each callback delivers all relevant message details and multimedia content using a structured multipart/form-data payload, as defined by the MM4 MO schema.

Intended Audience

  • Messaging Aggregators
  • Partner Developers
  • Integration Engineers
  • API Consumers Building MMS Routing Solutions

API Summary

Protocol: HTTPS (REST, POST method)

Payload: multipart/form-data (inbound message metadata + base64-encoded attachments)

Authentication: Callback endpoint defined by the aggregator; security requirements as per integration agreement

Versioning: Path-based (e.g., /callbackurl/1.0/)

Standard: OpenAPI 3.0.3

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