i guess when you reinsert the pool command cause dialer interface up.
but you can just use ping direct to remote dialer ip to bring up the isdn, depends on your interesting traffic setup.
ppp failed in authentication phase and it is 2 way authentication. You can remove ppp authentication in bri and dialer config on both sides, or apply the following on both routers:
local router - username rt-core2-100 password xxxx
remote router - username RT_AGN_ASA password xxxx
int dialer x
! send username/password
ppp chap hostname
ppp chap password
from memory if you don't specify username to send, router will use its hostname as username.
if isdn fail again, check the ppp debug again for CHAP phase to be success or fail. After authentication is the IPCP.
