If I understand you corectly you need something like this:debug dialerdebug isdn q931debug isdn q921debug modemThis will give you more then you need, so use only few of these commands at a time.
If you wan't to use different transation for those dialers I sugest you use route-mapsroute-map RM1 match interface Dialer1 match ip address 1route-map RM2 match interface Dialer2 match ip address 1!ip nat inside source route-map RM1 interface Dialer...
Since you do not want to use ACS and AD as its secondary database, you could try MS IAS, or simply configure kerberos authentication.Since kerberos IOS images are bigger, it might be a better idea to use IAS.