---
page_type: error
code: 32112
message: "32112: SIP: Invalid header value"
level: WARNING
---

## Description

The header you asked Twilio to stamp was omitted because it contains illegal characters in its _value_. Including this header would have resulting in Twilio generating a message that runs contrary to the SIP specification.

### Possible Causes

- If you specified headers in a SIP URI, invalid characters were most likely introduced by an escaped character. Escaped characters in SIP URIs are defined by a percent sign (%) followed by two hexadecimal digits specifying a character code.

### Possible Solutions

- If you are generating SIP headers from user input, ensure your application properly accounts for non-alphanumeric characters such as punctuation and whitespace, as well as international characters.