---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/13221#article
headline: "13221: Dial->Number: Invalid method value"
url: https://www.twilio.com/docs/api/errors/13221
inLanguage: en
dateModified: 2025-12-18T21:40:49.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 13221: Dial->Number: Invalid method value

Log Level: WARNING

## Description

The method attribute of Number must be `GET` or `POST`. See the [Dial Verb](/docs/voice/twiml/dial) API Reference for more information.