# 32503: Voice Conversation: Callback event response error.

Log Type: APPLICATION

Log Level: WARNING

## Description

Request to status callback URL received a response error from the customer-side server.

### Possible causes

* This error indicates that Twilio was able to reach the customer-provided URL, however, received an error from the customer-side callback endpoint.
* The URL provided was likely valid, but Twilio might be receiving an error from the customer-side service.

### Possible solutions

* Make sure you have a web server up and running that serves that URL with the configured method in TwiML, e.g. `POST`.