ISDN BRI-BRI with DDR

1.Configure interesting traffic, dialer-list and authentication for remote router

on HQ configure command as below

isdn switch-type basic-ni

username branch password cisco //specify username and password for remote router

dialer-list 1 protocol ip permit //permit all ip traffic for dialer group number 1

issue the same command for Branch router

username HQ password cisco

dialer-list 1 protocol ip permit

isdn switch-type basic-ni

2.Configuring the BRI interface to dial on demand

HQ

interface Bri0

 ip address 100.11.1.1 255.255.255.0

 no ip directed-broadcast

 dialer-group 1 //dialer list 1 was defined above

 isdn spid1 32177820010100

 dialer map ip 100.11.1.2 name branch broadcast 7782001 //number to call when match the ip address

 encapsulation ppp

 ppp authentication chap

Branch

interface Bri0

 ip address 100.11.1.2 255.255.255.0

 no ip directed-broadcast

 dialer-group 1

 isdn spid1 32177820020100

 dialer map ip 100.11.1.1 name HQ broad 7782002

 encapsulation ppp

 ppp authentication chap

ping from any router to it's peer, this should initiate an ISDN call
use this command to check the status of ISDN

show int bri0 1 2
show isdn status