Messaging MIME Types

To send MMS, you must include a media attachment. The content-type header must have an accepted content type, or SignalWire will have to reject the request.

Media Size Limits

The overall size limit is 1.2MB for local numbers and 750KB for toll-free numbers. Most carriers support message attachments with a total size of 1MB-1.2MB. However, to maximize deliverability across all carriers, limit your attachment size to 500KB.

Accepted MIME Types

All of the following MIME types are accepted. SignalWire will not modify the body content for device compatibility.

Type

Description

audio/mp4

mpeg layer 4 audio

audio/mpeg

mpeg layer 3 audio

audio/mpeg3

mpeg layer 3 audio

audio/ogg

ogg audio

audio/vorbis

audio compression format

audio/vnd.wav

wav format audio

audio/ac3

codec format audio

audio/amr

codec format audio

audio/midi

musical instrument digital interface format

image/jpeg

jpeg format image

image/gif

graphics interchange format

image/png

portable network graphics format

image/bmp

bitmap image format

text/plain

text file format

text/calendar

text file format

text/vcard

text file format

text/x-vcard

text file format

video/mpeg

mpeg video format

video/mp4

mpeg layer 4 video format

video/quicktime

quicktime video

video/h264

video compression format

video/3gp

media container format


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