how-to block ads
port 2427 - 2427 udp/tcp
port 16384 - 32767 udp only
The DVG ATA itself has a built-in firewall (as do the Linksys ATA models). However, for TBB service, regardless of how you connect the ATA to a broadband ISP, you normally should not have to configure any port forwarding settings either on the ATA or on the upstream router/gateway/firewall device/computer.
Note that when the ATA is connected to certain routers, there are some circumstances where the ATA needs to have port forwarding enabled or be placed in a DMZ to resolve port timeout issues with these routers (e.g., Linksys BEFSR41).
The reason that port forwarding is not needed is that the ATA initiates communication with the Primus TBB servers (upon powerup - see The Firmware Upgrade Process) and keeps this connection open for all transactions--whether outgoing or incoming calls.