Symptom

When your receive an Inbound MMS to your 10DLC number via Messages API you would see an Un-supported content type.

Applies To

• Messages API
• MMS
• 10DLC

Resolution

1. To receive Inbound MMS to your 10DLC you need to link your number to your Application which has Messages capability.
2. There are currently two versions of Messages API, version 0 (v0.1) and version 1(v1), and Inbound MMS to some 10DLC numbers would work only with Messages API version 1 (that is v1).
3. So to resolve the issue you need to change your Messages API version in your Application to v1. 
4. If you still see Unsupported after changing the application version to v1 then please contact support at support@api.vonage.com.

Cause

Inbound MMS to some 10DLC numbers currently only supports V1(Version 1) of Messages API.

Additional Information

Messages API Overview

WhatsApp v0.1 to v1 Migration Guide

Messages API Reference