Is it possible to mirror/monitor the DSL interface (atm/dialer interfaces) to one of the fastethernet ports on this device?
Running software: Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(11)XJ3, RELEASE SOFTWARE (fc1)
I can't find a definite answer either way
Have you tried something like the above?
Whilst the document isn't specific to your router, this Cisco document may be of interest to you