# 32113: SIP: Header name is not allowed

Log Type: APPLICATION

Log Level: WARNING

## Description

The SIP header you asked Twilio to stamp was omitted because it is not supported on the Twilio platform.

Twilio supports extension headers beginning with an X- prefix. Your extension header name cannot begin with the prefix `X-Twilio`.

### Possible causes

* SIP header name not supported on the Twilio platform.

### Possible solutions

* If your application can use a different header name, use an X- prefixed header name, e.g. if you want to use the name `Customer-Info`, see if your application can be configured to use `X-Customer-Info` instead.