Yes you are right but I have some problems in config:
I set a vpn server address in client.conf and in users as:

DEFAULT Client-IP-Address == 192.168.20.13, Auth-Type := Vpn, Autz-Type := Vpn,

in radiusd.conf:

ldap ldap-Vpn{
                server = "192.168.10.1"
                .....
                profile_attribute = "vpnProfileDn"
                access_attr = "vpnAccess"
                ....
        }
sqlcounter monthly-Vpn {
                counter-name = Monthly-Session-Time
                check-name = Max-Monthly-Session
                sqlmod-inst = sql-Vpn
                key = User-Name
                reset = monthly
query = "SELECT SUM(AcctSessionTime - GREATEST((%b - UNIX_TIMESTAMP(AcctStartTime)), 0)) FROM radacct WHERE UserName='%{%k}' AND UNIX_TIMESTAMP(AcctStartTime) + AcctSessionTime > %b "
}
Autz-Type Vpn{
                ldap-Vpn
                monthly-Vpn
        }
Auth-Type Vpn{
                ldap-Vpn
        }
Acct-Type Vpn {
                sql-Vpn
        }

Now the users that come from this vpn server are the same but there are parameters in ldap server that are different in admins and other users. I want give to admins' session-timeout different amount than others, but counter gives remain of monthly-count to users as session-timeout.
It is good for regular users but how and where I should give this parameter to admins as different amount?