I'm really pissed off. I consider this is not NetSim's problem. But what did I do wrong?
After I configured all the routers and switches. the bri0 interface is still "down". Can someone tell me?

router1:
interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
no ip directed-broadcast
!
interface FastEthernet0/1
no ip address
no ip directed-broadcast
shutdown
!
interface Bri0
ip address 192.168.40.1 255.255.255.0
no ip directed-broadcast
dialer string 7782002
dialer-group 3
isdn switch-type basic-ni
isdn spid1 32177820010100
encapsulation ppp
!
!
router rip
network 192.168.10.0
network 192.168.40.0
!
ip classless
no ip http server
!
ip route 192.168.30.0 255.255.255.0 192.168.40.2
!
!
dialer-list 3 protocol ip permit
!
isdn switch-type basic-ni
rotuer2:
!
interface FastEthernet0/0
ip address 192.168.30.1 255.255.255.0
no ip directed-broadcast
!
interface FastEthernet0/1
no ip address
no ip directed-broadcast
shutdown
!
interface Bri0
ip address 192.168.40.2 255.255.255.0
no ip directed-broadcast
dialer string 7782001
dialer-group 2
isdn switch-type basic-ni
isdn spid1 32177820010100
encapsulation ppp
!
!
router rip
network 192.168.30.0
network 192.168.40.0
!
ip classless
no ip http server
!
ip route 192.168.10.0 255.255.255.0 192.168.40.1
!
!
dialer-list 2 protocol ip permit
!
isdn switch-type basic-ni
line con 0
login
router3:
!
interface FastEthernet0/0
ip address 192.168.10.2 255.255.255.0
no ip directed-broadcast
!
interface FastEthernet0/1
ip address 192.168.20.1 255.255.255.0
no ip directed-broadcast
!
interface Bri0
no ip address
no ip directed-broadcast
shutdown
!
!
router rip
network 192.168.10.0
network 192.168.20.0
!
ip classless
no ip http server
!
switch1:
hostname switch1
!
!
!
!
ip address 192.168.20.5 255.255.255.0
ip default-gateway 192.168.20.1
!
switch2:
!
hostname switch2
!
!
!
!
ip address 192.168.30.5 255.255.255.0
ip default-gateway 192.168.30.1
!