We have an IP7000 running off of an IPedge that works perfectly while connected to the same local LAN. When the Polycom is reconfigured to work offsite, the phone will not stay registered. I can get it to register and make a call, however the call will drop in usually under a minute and the station will un-register from the edge. Even when idle, the station will un-register after so long. It is a Ubiquiti firewall and Comcast as the ISP. The firewall is pretty much swiss cheese at this point. Any ideas?