---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/31955#article
headline: "31955: Stream Extension: Unsupported operation"
url: https://www.twilio.com/docs/api/errors/31955
inLanguage: en
dateModified: 2026-04-08T17:33:56.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 31955: Stream Extension: Unsupported operation

Log Type: APPLICATION

Log Level: ERROR

## Description

Twilio received a request for an operation that the Stream Extension does not support. Not all Stream Extensions support all operations, such as the start/stop API.

### Possible causes

* You attempted to start or stop a Stream Extension using the start/stop API, but the extension is not configured to support this operation.
* The extension you are targeting does not support invocation via the start/stop API.

### Possible solutions

* Confirm that the Stream Extension you are using supports the operation you are attempting.
* Review the Add-on documentation to verify which operations are supported for the extension.
* Use the TwiML-based approach if the start/stop API is not supported for this extension.

#### Additional resources

* [Marketplace listings](/docs/marketplace/listings)
* [Installed Add-ons Extensions Subresource](/docs/marketplace/api/installed-add-ons-extensions)