I have two Cisco 2811 routers connecting my Head office and Branch office via Metro E link. I have setup and configured ISDN link as backup for this MetroE link. I am testing on the ISDN connectivity. I am getting disconnected with in a second after the connection is established. The debug error says " ISDN_HANGUP received. I didn't configure anything on this (or I may unknowingly configured it). Please help to identify the problem and let me know how can i correct it.
The configuration and debug is attached
now that I see the whole configurations I see that you have enabled AAA new model.
I've reviewed some configurations I used in a similar scenario:
I would add the following in global config:
aaa authentication ppp default local
on both routers
Hope to help