48005: Callback failed due to timeout

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.

• 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.

• 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.

• Frontline documentation
• [Help Center]https://help.twilio.com/