We've been having issues over the past several months with our WAN connection going down, and all of our phones at the remote office trying to register and run across our backup 10meg line, which of course isn't making things very happy. When our system was setup by our VAR, they configured us to have one CallManager (CCM5.1) group, with a publisher at the remote office, and the subscriber here at the main office.
Is it possible to split that out into two groups? What I'm looking at doing is having both groups set to register to the subscriber here at the main office, and in the event of a WAN issue, manually changing priority on one group to register the phones directly to the publisher. Would that work at all? How much of an overhaul would it be to split one group into two? Would it even work, would changing the registration priority cause the phones to automatically re-register?