---
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"@id": https://www.twilio.com/docs/api/errors/13810#article
headline: "13810: Reject: Invalid cause"
url: https://www.twilio.com/docs/api/errors/13810
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 13810: Reject: Invalid cause

Log Type: APPLICATION

Log Level: WARNING

## Description

A call is rejected for any reason other than Busy or Hangup

### Possible causes

Could be timeout, cancelled, or no-answer.

### Possible solutions

Check application call timeout duration.