Need Help with Comcast BWG (new Cisco DPC3941B) in Bridge Mode, 5 static public IPv4 addresses
I'm helping set up a small business office in metro Atlanta, they're provisioned with a Comcast Cisco DPC3941B and a 5-block of static IPv4's. We're consistently measuring 115+ Mbps downstream in their location - smokin' fast, very sweet. We plan to have the Comcast BWG set up in Bridge Mode, directly feeding a Dell SonicWall NSA250M firewall that's our primary router and local DHCP server.
The problem is that our cloud-based VoIP provider wants to install an Edgewater Networks 4550 ESBC/MVG to manage their over-the-top VoIP services. This box has a 30Mbps max throughput, and it will throttle our bandwidth if we add it in series between the BWG and the firewall. The functionality and capabilities of the Comcast BWG in Bridge Mode is unclear to me and poorly documented at best; I can't find a shred of documentation to help me. I'm particularly confused about the visibility of our 5 static IP addresses to the Internet via the BWG, how does that work exactly??? How exactly are those devices accessed from the Internet when the BWG is in Bridge Mode?
I happened to notice that both LAN Port 1 and LAN Port 2 appear to be active when the BWG is in Bridge Mode (LAN Ports 3&4 are disabled).. I was thinking that we could connect our firewall/router (with its own static IPv4) to LAN Port 1, and the Edgewater MVG (with its own static IPv4) to LAN Port 2, effectively using the Cisco DPC3941B BWG as a 2-port switch (??). Advice? Suggestions on a possible connection scheme?