---
page_type: error
code: 15004
message: >-
  15004: Action Callback URL must be an absolute URL when using TwiML to update
  in-progress calls
level: ERROR
product: Programmable Voice
---

## Description

The TwiML provided for updating the in-progress call must use absolute URL for action callback.

### Possible Causes

A relative URL is provided for action callbacks when updating in-progress call with TwiML.

### Possible Solutions

Provide an absolute URL for the action attribute when updating in-progress call with TwiML.