Where can I find the original header from a transcoder?

[gh_]

I am using the latest Tera-WURFL release, there is a possible header location for the original ua (cap['transcoding']['transcoder_ua_header']), if passed by a transparent transcoder. For testing, I am using an n-71 phone with opera mini, and trying to find the n-71 ua when i request a page, but it isn't part of the $_SERVER variable, is there somewhere else I can look for this value? Or is Opera mini not passing it at all? (in which case I understand that I cannot get to it, and I'd appreciate a recommendation for a transparent transcoding browser with which to test this on my n71)

To rephrase: I am looking for the original ua string, if I can get it, from behind a ( hopefully transparent ) transcoder.
I know that a possible header location is given in, but cannot find this header in practice.

[kamermans]

If the original UA is not in the $_SERVER request, unfortunately it is lost. Sometimes instead of passing the original UA the device will send a bastardized version of the Opera Mini UA with some information about the device.