I have four T1 with ATM IMA configuration. The ATM interfaces are up/up state; However, when I bound the ima-group 0 statement to the ATM interfaces, the four atm interfaces will goes down. Do anyone have any idea about this? Am i missing anything on the config? 
Thanks,
Peter
 interface ATM1/0
 no ip address
 no atm oversubscribe
 no atm ilmi-keepalive
 ima-group 0
 no scrambling-payload
!
interface ATM1/1
 no ip address
 no atm ilmi-keepalive
 ima-group 0
 no scrambling-payload
!
interface ATM1/2
 no ip address
 no atm ilmi-keepalive
 ima-group 0
 no scrambling-payload
!
interface ATM1/3
 no ip address
 no atm ilmi-keepalive
 ima-group 0
 no scrambling-payload
 pvc 2/35 
interface ATM1/IMA0
 description IMA Group 0
 no ip address
 no atm ilmi-keepalive
 ima clock-mode independent
!
interface ATM1/IMA0.1 point-to-point
 bandwidth 6000
 ip address 168.x.x.x 255.255.255.128
 ip access-group 101 in
 no ip unreachables
 crypto map clientmap
 pvc 2/35