Inter-domain between CUPS and OCS will work Presence and IM as per documentation. what about RCC?
looks RCC doesn't work since OCS has different domain (correct me if I'm wrong). if then, RCC via intra-domain only?
CUCM does not support two AD domains. For example, if you have john in domain A and john and domain B, there's no way to avoid the conflict in AD synchronization.
For the same reason, RCC never expect this.