---
page_type: error
code: 21258
message: "21258: Invalid SIP Manipulation Policy"
level: ERROR
product: Elastic SIP Trunking
---

## Description

There was a validation error for the Sip Manipulation Policy in question.

### Possible Causes

Reference the docs for configuration information - https://www.twilio.com/docs/sip-trunking/sip-header-manipulation

### Possible Solutions

Reference the docs for a possible configuation solition - https://www.twilio.com/docs/sip-trunking/sip-header-manipulation