When R1 Serial Int goes down, Dialer comes up, Dials via BRI to R2. Connection establishes, Authenticates (CHAP) normally, but I can't ping R2 from R1 or Visa Versa.
make sure to use the exact names (case sensitive) in dialer-map statements if you are using it. Anyway, we need to see the configs from both with following debug
debug isdn q931
debug dialer
debug ppp nego
term mon
Here is the link for config and troubleshooting etc
