I am not sure what caused the error. Would you post the output of show isdn status? It might also be helpful if your would run debug isdn q931, try the test again, and post any output produced by debug.
make sure that you do not disconnect your sessions with the 'clear interface' command, but use the 'isdn test disconnect' instead, since 'clear interface' causes certain ISDN switches to not properly disconnect sessions.
Also, with your current config, only your Router 1 can call your Router 2, is this what you want ?
Make sure that your the CHAP hostnames match on both sides (they are case sensitive).
Try and modify your config as following:
ip address 126.96.36.199 255.255.255.252
dialer idle-timeout 180
--> dialer map ip 188.8.131.52 name CHNDGMP001 broadcast 018503654
Thanks for posting the output of show isdn status. The output looks normal and seems to show a connection ready to work.
Is the ISDN the primary connection to the other router or is the ISDN perhaps a backup connection? (If some interface is configured with backup interface bri2/5 then that puts the BRI interface into a state where it can not initiate a call unless the primary link is not available)
Given what you have shown us I believe that the output of debug isdn q931 would be quite helpful.
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