MMS converter

While your message's source number may support sending MMS, the destination number might not support receiving it. Normally, this will prevent you from sending MMS to this destination. When MMS converter is enabled on your messaging profile, however, your MMS will be converted to an SMS message by Telnyx and then sent to the destination. Messages sent as SMS are unaffected by this feature and will be sent as usual.

The resultant webhooks for messages sent with this feature enabled will indicate the protocol that was used to send the message. For example: when an MMS message is sent and fallback happens, the webhook will indicate that an SMS message was sent, and when an MMS message is sent and fallback doesn't happen, the webhook will indicate that an MMS message was sent.

If fallback happens, the destination will receive an SMS formatted to contain the media URLs specified in the request. Each media URL will appear on its own line, immediately after the message body, if any.

Note how the media URL(s) appear on the destination exactly as provided in the request. No shortlinking or other transformations are applied on your behalf.

If your request includes:

• "text": "message body that\nis potentially spread across multiple lines"
• "media_urls": ["https://example.com/image.png"]

The message received on the destination will look like this:

message body that
is potentially spread across multiple lines
https://example.com/image.png

If your request includes:

• "text": "message body"
• "media_urls": ["https://example.com/one.png", "https://example.com/two.png"]

The message received on the destination will look like this:

message body
https://example.com/one.png
https://example.com/two.png

If your request doesn't set text and includes:

• "media_urls": ["https://example.com/image.png"]

The message received on the destination will look like this:

https://example.com/image.png

This behavior is not enabled by default; if you want to make use of this feature then you must enable it first. This is controlled at the messaging profile level by an optional boolean field called mms_fall_back_to_sms, which you can either set at creation time or update later if you'd like to change an existing messaging profile.