Hey guys, So I'm looking for some advice on a setup. We are looking for a way to incorporate a little bit of backup in a setup. What we have is a central office where 3CX is located "v12sp4 / NexVortex as Trunk Provider" We then have a remote office. The 2 offices are connected my a site-to-site VPN tunnel. All is fine and dandy. The thought that had come up was if the VPN tunnel ever down or the internet at the main location was ever down both locations with be without phones. The first thought would be to put a phone system in both locations. Due to the fact they have phones logged in to the same queue at both locations limits this ability aside from putting 2 accounts on each phone... The idea came to put a Patton SN5200 which can act as a SBC at the remote location. The Patton unit could be registered to nexvortex and register to 3CX.... As a solution to 911 we could setup the physical phones with a seperate account to target the SN5200 whenever 911 is dialed.... The real question is in this setup. Could we potentially on the phones have the outbound proxy set to the SN5200. Then have the SN5200 route the call to the 3CX. If the 3CX is unavailable route the call directly out to NexVortex through the SN5200. This would allow for if the system was ever down at the main locations the phones in the remote location could still make outgoing calls... The routing through the SN5200 is the same idea the 3CX SBC has of routing the traffic through it just with the added feature of going directly to NexVortex if ever down. Any thoughts on this?