---
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"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/80913#article
headline: "80913: Out-Of-Session Callback Error"
url: https://www.twilio.com/docs/api/errors/80913
inLanguage: en
dateModified: 2026-07-14T12:30:02.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 80913: Out-Of-Session Callback Error

Log Type: APPLICATION

Log Level: ERROR

## Description

Callback to Out-of-Session handler returned a non-success status code.

### Possible causes

* Your Out-of-Session callback URL is invalid.

### Possible solutions

* Verify that your Out-of-Session callback URL is valid and that your server is correctly processing Out-of-Session callbacks from Proxy.
* For more information, see the [Out-of-session callback guide](/docs/proxy/out-session-callback-response-guide).