---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/48005#article
headline: "48005: Callback failed due to timeout"
url: https://www.twilio.com/docs/api/errors/48005
inLanguage: en
dateModified: 2026-07-14T12:30:02.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 48005: Callback failed due to timeout

Log Type: APPLICATION

Log Level: ERROR

## Description

Twilio received a timeout while waiting for your Frontline Integration Service callback response. Frontline expects your callback endpoint to return a response within 6 seconds. If your service takes longer, Twilio can't complete the request and returns this error.

### Possible causes

* Your Frontline Integration Service performs work that takes longer than 6 seconds before sending a response.
* Your callback endpoint depends on a slow upstream service, such as a CRM, identity provider, or internal API.
* Your server is experiencing high latency or resource contention, which delays the callback response.
* Network issues between Twilio and your callback endpoint increase response time beyond the timeout limit.
* Your endpoint does not return a complete HTTP response after receiving the callback request.

### Possible solutions

* Update your callback implementation so it returns a response in less than 6 seconds.
* Move long-running work out of the synchronous callback flow. Return a response quickly, then complete follow-up processing asynchronously in your application.
* Review your endpoint logs and application performance metrics to identify slow operations, blocked requests, or failed upstream dependencies.
* Reduce external dependencies during callback handling when possible.
* Verify that your callback URL is publicly reachable and that your server can consistently accept and respond to requests without delay.
* Add timeout handling, retry logic, and performance monitoring in your application so you can detect and fix slow callbacks before they affect Frontline requests.

#### Additional resources

* [Frontline documentation](/docs/frontline)
* [Help Center](https://help.twilio.com/)