One issue I've found, on many of the non-7500 platforms, class-default FQ appears to distort the minimum bandwidth allocations for other non-LLQ classes. To avoid this, I either just use LLQ and class-default with FQ, or switch class-default to FIFO. If you chose to just use LLQ and class-default FQ, you could move your other classes to LLQ and/or allow them in class-default which normally uses WFQ (NB: where they should obtain more bandwidth because of their higher ToS markings vs. BE marked flows).
On ATM links, at least with some IOS revs., when supporting real-time traffic, you might also need to decrease the tx-ring-limit. For 4 Mbps, the minimum setting might be acceptable.
"Show policy-map interface output" should indicate how the policy is working.
Further on the subject of "working", I wonder about, configured on the ATM interface, "ip pim sparse-dense-mode", "ip nat inside", and "crypto map RK-EC-IMA". Depending on the type of ATM PVC, you might also consider defining a point-to-point subinterface. Also, if your PVC is something like a vbr with a SCR much smaller than the PCR, you might need to examine how that might impact your real-time traffic.
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