---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21503#article
headline: "21503: Invalid transcription type"
url: https://www.twilio.com/docs/api/errors/21503
inLanguage: en
dateModified: 2025-12-18T21:40:49.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21503: Invalid transcription type

Log Level: ERROR

## Description

The transcription value you provided is invalid. You may use one of: "true" or "false".