Pls see below scenario
One Cisco 2620-XM router with IOS 12.2T & Cisco 1751V router with IOS 12.3T.
Now Cisco 2620 router is dialing BRI interface of Cisco 1751 Router & call is perfectly established & Data is processed in both way. But if dialer string is removed from 2620 router & dial happens through 1751. Call doesn't establish even after many trys it appears in ISDN history as called failed. Could you what's wrong here. Awaiting your reply
You can look the command below on both Cisco 2620 & Cisco 1751V routers.
Cisco 2620-XM
!
Interface BRI 1/1
ip address 172.17.1.1 255.255.255.252
encapsulation ppp
dialer string 0145234569
dialer idle-timeout 1500
dialer-group 1
!
Cisco 1751V
!
Interface BRI 0/0
ip address 172.17.1.2 255.255.255.252
encapsulation ppp
dialer string 01122965748
dialer idle-timeout 1500
dialer-group 1
!
