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We will create a WAN connection over ISDN multilink dialup.
An ISDN have two channel 128kbps. We will dial a channel first and then dial last one once bandwidth usage reach 128kbs. In this sample config isdn type is basic-net3, call your telco company to make sure your isdn type. Idle-timeout is 60sec.

Requirement
- Cisco router with ISDN BRI interface
- ISDN line each site
- ISDN NT1

Hostname RouterA
!
enable secret ciscopass
!
username isdnpppuser password 7 isdnppppass
ip subnet-zero
!
isdn switch-type basic-net3
!
interface FastEthernet0
 ip address 192.168.1.254 255.255.255.0
 no shutdown
!
interface BRI0
 ip address 10.1.1.1 255.255.255.252
 encapsulation ppp
 dialer idle-timeout 60
 dialer map ip 10.1.1.2 name isdnpppuser 123456789 <= remote isdn number
 dialer load-threshold 128 either
 dialer-group 1
 isdn switch-type basic-net3
 random-detect
 ppp authentication chap
 ppp multilink
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.1.1.2
!
access-list 101 deny ip any host 255.255.255.255
access-list 101 permit any any
!
dialer-list 1 protocol ip list 101
!
line con 0
 exec-timeout 0 0
!
end

===

Hostname RouterB
!
enable secret ciscopass
!
username isdnpppuser password 7 isdnppppass
ip subnet-zero
!
isdn switch-type basic-net3
!
interface FastEthernet0
 ip address 192.168.2.254 255.255.255.0
 no shutdown
!
interface BRI0
 ip address 10.1.1.2 255.255.255.252
 encapsulation ppp
 dialer idle-timeout 60
 dialer map ip 10.1.1.1 name isdnpppuser 987654321 <= remote isdn number
 dialer load-threshold 128 either
 dialer-group 1
 isdn switch-type basic-net3
 random-detect
 ppp authentication chap
 ppp multilink
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.1.1.2
!
access-list 101 deny ip any host 255.255.255.255
access-list 101 permit any any
!
dialer-list 1 protocol ip list 101
!
line con 0
 exec-timeout 0 0
!
end

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