Efelin Novak writes:
The request uri after redirect will be UserC@another_domain. I have to store the original request_uri(UserB@my_domain) and after redirect, insert it to Billing Party header in radius message.
yes, i had a typo in my answer. you, of course, need to use request uri before redirect as your billing uri. i wonder why you asked, when you knew the answer yourself.
-- juha