Configure ISDN between R2 and R4 using network 220.127.116.11/30.
Advertise ISDN network in Area 1 using MD5 authentication.
Configure PPP callback using the RADIUS server in VLAN2, as demonstrated in the example following item 4.
Configure R2 as a callback server and R4 as a callback client.
Configure static NAT translation and conduits on PIX for AAA server, as demonstrated in the following example:
PIX(config)# show static static (inside,outside) 18.104.22.168 10.1.1.254 netmask 255.255.255.255 0 0 PIX(config)# show conduit ...