WCCP and ISDN / Dialer

We have two routers running the same IOS version in our core - c7200-is-mz.123-10a.bin. One terminates a number of tunnels and the other has a number of dialer interfaces associated with an ISDN PRI. Each of our site routers has a tunnel going to the core (via an ADSL connection) and a backup ISDN interface with a dialer configured. When we are running on the primary links everything works fine. When we are running on the backup links (the ISDN) WCCP redirection seems to prevent clients from accessing services on TCP in the core (I can telnet to the core ISDN router from a PC on site, but can't access anything else). Ping always works fine - hence my suspicions about WCCP. If I disable WCCP on the core router with the ISDN links backup connections work fine.
Our remote routers use c2800nm-advsecurityk9-mz.124-11.T4.bin.
My question is - is there any issue with WCCP redirection and dialer interfaces?
Below is the relevant config for the routers that don't work (addresses, names and numbers have been sanitized.
corerouter#
ip wccp 61
ip wccp 62
interface Dialer183
description Backup DoD for remote site
bandwidth 64
ip address 192.168.1.1 255.255.255.252
ip wccp 61 redirect out
ip wccp 62 redirect in
encapsulation ppp
dialer pool 2
dialer remote-name siterouter
dialer idle-timeout 300
dialer enable-timeout 60
dialer wait-for-carrier-time 10
dialer caller 222222
dialer-group 1
snmp ifindex persist
ppp authentication chap
End
siterouter#sh run
ip wccp 61
ip wccp 62
interface Dialer1
description Backup DoD to the core via ISDN
bandwidth 64
ip address 192.168.1.2 255.255.255.252
ip wccp 62 redirect in
encapsulation ppp
dialer pool 2
dialer remote-name corerouter
dialer idle-timeout 300
dialer enable-timeout 60
dialer wait-for-carrier-time 10
dialer string 111111
dialer caller 222222
dialer-group 2
ppp authentication chap
end

Zach,
I've tried that as you suggested and it made no difference. I had seen a bug on the bugtracker about process switched packets possibly not being WCCP redirected correctly, so I have also tried ensuring that CEF was enabled, and removing compression in case that made the packets process switch.
I have also tried removing the multilink and ensuring that only one ISDN B channel is pulled up for that dialer interface. That made no difference.
I have verified that it is the router in the core that is causing the issue because I can have the remote site connect to the core via ISDN and have WAAS optimise traffic from that remote site to another remote site via the core (if I disable WCCP in the core).
Thanks,
Peter

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