---
page_type: error
code: 32711
message: >-
  32711: Voice User-Defined Message: Request to subscription callback URL
  encountered error 
level: WARNING
product: Programmable Voice
---

## Description

Twilio received an error response when attempting to send a User-Defined Message event to the UserDefinedMessageSubscription callback URL.

### Possible Causes

- The UserDefinedMessageSubscription callback URL is incorrect.
- Your endpoint at the UserDefinedMessageSubscription callback URL was not responding or responded with a 400- or 500-level HTTP status code.

### Possible Solutions

- Make sure that the UserDefinedMessageSubscription callback URL is correct.
- Make sure that your endpoint at the UserDefinedMessageSubscription callback URL can successfully receive and respond to requests with 200-level HTTP status codes.