We currently have a CS1000M with one sig server in our main location. We are looking into our options as far as having redundant systems across the board (data and voice) as opposed to restoring at a hot site/forwarding numbers in the event of a disaster. What recommendations can you give me as far as the best option PBX wise to accomplish this. We obviously don't want a full CS1000M at the alternate site because of cost, but do want something that would take little to no time to come up (preferably a hot failover) that is as cost effective as possible. Currently about 350 stations in our building, but would need about 50-75 in the case of a true disaster as a start. Any suggestions would be appreciated.