---
page_type: error
code: 32710
message: "32710: Voice User-Defined Message: Subscription Callback Internal Error"
level: WARNING
product: Programmable Voice
---

## 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.