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Installation
Firewall Ports to Open:
IP Phones/ATA Adapters need port 5060 UDP and the range of 16384-
16482 UDP inbound and outbound open.
In some cases, multiple IP Phones/ATA Adapters on the same
network/router will need to change the 5060
port number to another
available port [examples: 5062, 5064, 5090…). This will mainly happen
with older routers, but some newer models may still be affected as well
and require a different port for each IP Phone/ATA Adapter.