Cisco WAN :: Avaya G350 / QoS For Inbound Traffic

I have a remote office with a 1.54mb circuit connected to our private MPLS network.  Our main office has a 20mb conneciton to said network.  I want to set a QoS policy for traffic from the remote office to our Avaya subnet within the main office.  This policy is to give priority to all traffic to the Avaya G350.
 
I have set up the outbound traffic policy on our remote office router using a policy map as follows:
 
access-list 101 permit ip any 192.168.0.0 0.0.255.255 (this represents the Avaya subnet)
 class-map match-all voice_outbound
match access-group 101 
policy-map voip_outbound
class voice_outbound
   priority percent 50
 interface Serial0/3/0
service-policy output voip_outbound
 
This works fine for outbound traffic.  Now how do I give priority to inbound traffic from the 192.168.0.0 network?  When I try to do similar command it says CBWFQ is only configurable as output, not input.
 
I'd just limit it at the far end, but that has a 20mb pipe.  All other traffic from our corporate datacenter, as well as internet traffic, flows from the main office to the remote office.  Should I just rate limit everything else destined for the remote office subnet, and if so, what's the best method?