CBWFQ is not working as expected

[confus9d]

Hello,

I have configured class based weighted fair-queue for 2 of my routers. I'm assigning priority and 60% bandwidth to voip subnets (for local and remote sites) at my Hub site that has 6Mbps of MPLS bandwidth. At one of the remote sites I have cbwfq configured with priority and 75% (default max) bandwidth to voip subnets (local and remote) out of 1.5Mbps of MPLS bandwidth. All other traffic is configured with fair-queue. Now the issue is if I do a file transfer as a test between 2 servers going from hub to remote that are not on the VoIP subnets, i see it's taking up almost all the mpls bandwidth at remote site and my voip quality becomes choppy at the remote end. Could anyone help me find why voip gets choppy while i do a data transfer eventhough i have configured voip with high priority and reserved bandwidth?

Here is a portion of my configurations:

Remote:

!
class-map match-any VoIP
match access-group 101
!
!
policy-map VoIPQoS
class VoIP
priority percent 75
class class-default
fair-queue
!
interface Serial0/3/0
description MPLS
ip address xxxxxxxxxxxxxxxx
service-policy output VoIPQoS
!

access-list 101 remark VoIP Traffic
access-list 101 permit ip VoIP_subnet_Local VoIP_Subnet_Remote
access-list 101 permit ip VoIP_subnet_Remote VoIP_Subnet_Local


Hub(local):


!
class-map match-any VoIP
match access-group 151
!
!
policy-map VoIPQoS
class VoIP
priority percent 60
class class-default
fair-queue
!
interface Serial1/0
description MPLS
ip address xxxxxxxxxxxxxxxx
dsu bandwidth 6144
no cdp enable
service-policy output VoIPQoS
!

access-list 151 remark VoIP Traffic
access-list 151 permit ip VoIP_subnet_Local VoIP_Subnet_Remote
access-list 151 permit ip VoIP_subnet_Remote VoIP_Subnet_Local


Thanks.