Radius Tunnel Attributes (Tunnel switching with Cisco Router)

[mike at ostw.de]

Hi,

im new to this list and looking forward to get a solution for my problem
listet below :)

I have a working configuration like 

dialinuser-texas -> cisco7200 -> cistron radius-server-texas

Any dialinrequests (acct&auth) are given from the cisco to the cistron
radius-server, works nice, usere will be locally terminatet (authenticatet).
Now i want to switch SOME of our dialinusers to a different cisco like this,

dialinuser-newyork -> cisco7200 -> cistron radius-server-texas -> cisco3600
(ip:20.20.20.20) -> cistron-radius-server-newyork

I heard, that it is possible to configure the cistron user (with tunnel
attributes) like this (example from cisco.com)

Cistron-server-Texas:

username-texas Password = "12345"
    Service-Type = Outbound-User,
    Tunnel-Type = L2TP,
    Tunnel-Medium-Type = IP,
    Tunnel-Server-Endpoint = "20.20.20.20",
    Tunnel-Assignment-Id = "1",
    Tunnel-Password = "test",

Is this configuration ok ? anything missing ? i tested this config, but it
doesent work, user will not be switched to cisco with ip 20.20.20.20, there
is no incomming vpdn traffic (debug vpdn says nothing :( )
How do i have to configure the cistron-server and cisco(s) that dialinusers
will be switched to another cisco ?
any help is welcome !

greets
mike