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Public Beta Caveats and Limitations

Public Beta

Voice Intelligence is currently available as a public beta release. Some features are not yet implemented and others may be changed before the product is declared as Generally Available. Beta products are not covered by a Twilio SLA.

Learn more about beta product support.

General Limitations and Caveats

  • As a Public Beta product, Voice Intelligence is currently not included within Twilio’s helper libraries. You will need to make requests directly against the API while the product is in Public Beta.
  • Voice Intelligence is not PCI or HIPAA compliant.
  • Encrypted recordings are not supported.

Transcripts App

  • In past pre-release documentation, the Transcripts App was called Discovery. The old name is still used in some places, such as app retrieval URLs.
  • Transcripts are indexed and available for search for 90 days.
  • Search terms are linked with the OR operator. For example, macaroni salad will match transcripts that have macaroni OR salad).


  • The following limitations apply when fetching media stored in a third-party location (specified by a MediaUrl).
    • Currently, Voice Intelligence does not send an X-Twilio-Signature header for media fetch requests. As a result, media stored in Twilio Assets needs to be made public.
    • If you use external recordings, Basic authentication on MediaUrls is not supported. If you store the recordings on S3, use a presigned URL. And when storing them on Azure Blob Storage, use a Shared Access Signature (SAS).
    • MediaUrls that respond with a HTTP status code that is not a 200 will result in a transcription request that does not complete.
    • Requests to fetch third-party media are performed exactly once. There is currently no retry behavior.
  • Voice Intelligence does not perform speaker diarization on recordings. The use of mono recordings will result in lower transcription accuracy.
  • Recordings that are under two seconds in length are not transcribed.
  • Only up to two Participants can be overridden in the Channel object of the Transcript resource.
  • Voice Intelligence will only process recordings or 3rd party media that are under 1GB.

Language Operators

Transcription Viewer

  • In past pre-release documentation, Transcription Viewer was called Annotator or Conversation Viewer. The old name is still used in some places, such as app retrieval URLs.
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