Hi Sweet ,
Can you paste sh isdn status output of both the routers.
You missed the command "encapsulation ppp" under bri 0 of IOB_Sampang router.
Add the above command and check the issue.
If you are facing the same problem then modify config of both the router as mentioned below.
IOB_Sampang router :
username IOB_Sukumvit password 0 cisco
interface BRI0/0/0
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
isdn point-to-point-setup
!
interface Dialer0
description Dialout Link 128K To Sukumvit
ip address 192.168.1.1 255.255.255.0
encapsulation ppp
dialer pool 1
dialer string 023026221
dialer-group 1
ppp authentication chap
ppp chap host-name IOB_Sampang
ppp multilink
!
IOB_Sukumvit Router :
username IOB_Sampang password 0 cisco
!nterface BRI0/0/0
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
isdn point-to-point-setup
Int dialer 0
ip address 192.168.1.2 255.255.255.0
encapsulation ppp
dialer pool 1
dialer caller XXXX (isdn no of other router)
dialer-group 1
ppp authentication chap
ppp chap host-name IOB_Sukumvit
ppp multilink
!
dialer-list 1 protocol ip permit.
All the best :)
Satish
