Hi Rich,
Can you please provide the configuration of the 2811?
The clocking configuration should look like the following if you're going to configure an IMA circuit:
network-clock-participate wic 0
network-clock-participate aim 0
network-clock-select 1 T1 0/0
network-clock-select 2 T1 0/1
If you're to configure individual ATM/T1 circuits then you don't need to participate the AIM module.
Let me know how it goes.
Regards,
Juan