This is possible. To set this up, you need quite some configuration. I have extracted the vital parts from a working config. You have to configure it like this on both routers. Keep the names and IP's unique.
Configuration example:
!
hostname test-r02
!
user test-r01 passw cisco
!
interface Loopback1
ip address 10.253.235.1 255.255.255.0
no ip directed-broadcast
!
controller E1 1/0
framing NO-CRC4
pri-group timeslots 1-31
description ISDN30
!
interface Serial1/0:15
description ISDN30
no ip address
no ip directed-broadcast
encapsulation ppp
no ip route-cache
no logging event link-status
dialer pool-member 1 max-link 60
isdn switch-type primary-net5
no cdp enable
ppp authentication chap pap
!
interface Dialer4
description Test
bandwidth 64
ip unnumbered Loopback1
no ip directed-broadcast
encapsulation ppp
no logging event link-status
dialer remote-name test-r01
dialer idle-timeout 300
dialer enable-timeout 2
dialer string
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap
!
ip route dialer 4
I realize that it is a lot of config. Hope this gets you started anyway!
Goodluck,
Leo
