Can someone detail from a best practices standpoint how route patterns/CSS/Partitions on the CCM should be configured if using h.323 as gateway protocol?

In our design, we will have three sites each with PSTN connectivity (HQ houses CCM/VM). Phones need to be seperated by COS (local, local and LD, local LD and International).

So in the above, do I just create a single route pattern on the CCM for each site (9.@) and then specify the more specific router patterns on the h.323 dial-peers? And then also impliment COS on each h.323 gateway so I can differentiate each COS groups dialing ability?

Or should we use traditional partitions and CSS's on the CCM, and then for each location setup a local, ld and international route pattern (pointing to the respective h.323 gateway). Then essentially have the same setup on the h.323 from a destination-pattern perspective (that matches route patterns on CCM for each location)? And thus it will be on the CCM that determines which route patterns a phone has access too?

thanks in advance,