Hi
a CUBE can perform CAC for sip calls, but only for calls going through OCS mediation server.
if your MOC users are located anywhere in the network, the internal call legs and also cal legs from MOC to mediation server will be without CAC.
The bandwith a MOC-MOC call may also wary from abount a5 to 90 kbps, så it would be difficoult to set up cac to a spesified bandwith og QoS priority class.
Maybe you should try to put the MOC/OCS call legs in a different QoS class than the the call legs outside Mediation server. in this case you can use CAC on the non OCS call legs and let the MS QoE mecanism handle the MOC/OCS par of the call.