Authenticating with CallingStationId only

[Patrik Backentoft]

Hello,

We have set up a FreeRADIUS for authenticating GPRS-users. However, we 
would like to authenticate based on CallingStationId only, i.e. not ask 
users to enter either user-name or password on a Mobile Station level.
We are connected to a NAS sending us  "void/void" if user/pw is not 
entered, and of course, the NAS sends the CallingStationId.

For a number of practical reasons, we would like to use the 
CallingStationId when authenticating.

My questions are:
is this possible at all, i.e. not entering user name and password and 
only use CallingStationId?
A few hints on where to modify, in order to avoid having the request 
rejected due to no user-name as is the case now.


Thanks in advance,

Patrik Backentoft
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