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
- SIP header name not supported on the Twilio platform.
- 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