---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21251#article
headline: "21251: Trunking CPS change not allowed"
url: https://www.twilio.com/docs/api/errors/21251
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21251: Trunking CPS change not allowed

Log Type: APPLICATION

Log Level: ERROR

## Description

### Possible causes

* This CPS change is not allowed.

### Possible solutions

* This CPS change is not allowed, kindly contact Twilio Support through the [Console](https://console.twilio.com) or [Help Center](https://support.twilio.com).