---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/32112#article
headline: "32112: SIP: Invalid header value"
url: https://www.twilio.com/docs/api/errors/32112
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 32112: SIP: Invalid header value

Log Type: APPLICATION

Log 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.