http://hl7.org/fhir/StructureDefinition/communication-media|5.2.0

It contains enriched media representation of the alert message, such as a voice recording. This may be used, for example for compliance with jurisdictional accessibility requirements, literacy issues, or translations of the unstructured text content in other languages.
NameFlagsCardTypeDescription & Constraints
Extension
0..*Attached media
 
extension
?..0
 
url
?..?
 
value[x] *
1..?
 
 
valueAttachment *
1..?Attachment