1. You can't send a call directly to a subscriber from one box to another via caller input - only local objects will appear in the list for direct access off a caller input key (you can use auto attendant dialing for this if you want which works across all boxes in a dialing domain). The only way to do this is to create call handlers on one box that do release transfers to subscriber extensions on the other box. The reason behind this is all direct DB links (i.e. one key rules) map to local objects only - in this case it needs to link to the primary call handler associated with a subscriber and those primary call handler objects do not get replicated around the directory so other Unity servers cannot use them as local objects.
2. There's currently no way to have the pager request initiated by a caller. Unity does notification triggers to various devices (14 of them currently) but they're based on messages left for the user, not caller actions. Such "find me follow me" type features are comming in the next major version of Unity currently in development (sorry, no release date we can publish yet).
