Mobile phone authentification

[Marc.Schlueter at comneon.com]

Hi all,
I'd like to use FREERADIUS as an authentification method for mobile
phones, but I'm not sure
A) if this is possible and
B) how to configure as I'm a newbie.

Please find following scenario:
A mobile phone user would like to access my server behind the
proxy/gateway by using a gprs connection of an official provider (e.g.
vodafone). Currently the mobile phone builds up a gprs connection to the
providers network and send a get.request to the server through the
proxy/gateway. My proxy/gateway simply forwards the request to the
server but can not authentificate it.
Especially authentification gets important for the application called
"MMS-Multimedia Messaging Service". In this case the client POSTs a
message, but leaves the sender-header in the message empty (=asks the
network to insert the proper information). Then my proxy/gateway can not
insert the proper information, but the server which has to process this
request requires the sender-header to perform billing actions for
example.

Now I was told that RADIUS is the solution. RADIUS is able to detect the
actual sender information and delivers this information to the
proxy/gateway which is then able to insert the missing value into the
sender-header and everybody's happy ;)

Someone was able to follow my thoughts?

What's currently available? A proxy/gateway, mobile-phones,
GPRS-connectivity and a RedHat machine for freeradius.

What's needed? Some support in configurating freeradius.


Comments are really welcome,

Rgds.
Marc