[c-nsp] AToM ip interworking AAL5->802.1q in 7200/12.2SB , possible?

[David Freedman]

Is this possible?  
I can't seem to find any concise documentation
that talks about L2VPN interworking support outside of 12.0S on 
7200/12.2S or 12.2SB for that matter.

Have the following setup I am trying to make work.

[CE1]---ATM--[PE1]--[P]--[PE2]--802.1q--[CE2]

PE1/CE1 using PA-A3-OC3 and PE2/CE2 using PA-FE-TX
all 7200/NPE-G1 running 12.2(31)SB3

CE1:

!
int a1/0.100 point-to-point
 ip address 10.10.10.1
 pvc 1/100 
  encapsulation aal5snap
!

PE1:

!
pseudowire-class FOO
 encapsulation mpls
 interworking ip
!
int a1/0.100
 pvc 1/100 l2transport
  encapsulation aal5snap
  xconnect <PE2> 100 pw-class FOO
!

PE2:


!
pseudowire-class FOO
 encapsulation mpls
 interworking ip
!
interface FastEthernet1/0.100
 encapsulation dot1q 100
 xconnect <PE1> 100 pw-class FOO
!

CE2:

!
int FastEthernet1/0.100
 encapsulation dot1q 100
 ip irdp
 ip address 10.10.10.1
!
 

I can get packets through the pseudowire from CE2->CE1 
but not in the other direction.
Traffic is arriving at PE1 on the ATM interface, I can see
it but its not having IP placed into the pseudowire,
I can tell this by the send counters for VC not incrementing.

This is most puzzling. 

12.0(S) is most certainly not an option for us as we require IPv6 support
for PE routers,

If anybody has done this or can spot something obvious please do tell..

Many thanks,

David Freedman