# 32710: Voice User-Defined Message: Subscription Callback Internal Error

Log Type: APPLICATION

Log Level: WARNING

## Description

Twilio experienced an unexpected internal error in attempting to deliver an User-Defined Message event to the callback URL provided in the Voice User-Defined Message Subscription request.

### Possible causes

* An error occurred during communication with Twilio internal services.

### Possible solutions

* See the Debugger in the Twilio Console for further information. If you repeatedly receive this error, please contact Twilio Support.