---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/37001#article
headline: "37001: WhatsApp Voice: Outbound calls are not supported in this region"
url: https://www.twilio.com/docs/api/errors/37001
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 37001: WhatsApp Voice: Outbound calls are not supported in this region

Log Type: APPLICATION

Log Level: ERROR

## Description

The business-initiated WhatsApp call failed because it is not supported in the Twilio region.

### Possible causes

Business-initiated WhatsApp calls are not supported in all Twilio regions.

### Possible solutions

Ensure that a business-initiated WhatsApp call is placed in the supported Twilio Region.