I want to be able to federate 2 separate CUCM clusters (different companies), so that IM&P users from each cluster can see each others presence status, make calls and do screen share, in other words act as if they are one cluster. This will be across a private MPLS link and not across internet.
I am wondering the best way to achieve this.
will it be via conditional forwarding entries on the DNS pointing to eachothers DNS servers as well as the usual SRV records?
Also is there a way to implicitly allow all the contacts from each company to be populated rather than having to find contact, which then sends a request per user for that user to have to "friend them"