Panasonic KX-TDA0490 Getting Started page 49

Is it possible to have static IP addressing?
Because the maintenance of the VoIP Gateway Card is carried out from a personal computer (PC)
through an IP network, the card must be assigned a static IP address.
Static IP addressing must be made possible even when the DHCP feature is used. For more details,
refer to "2.2.1 Network Parameters" in the VoIP Gateway Card Programming Guide.
Is network address translation (NAT/NAPT) disabled?
In a network where address translation techniques (e.g., NAT/NAPT) are used to convert between
global and local IP addresses, VoIP communications based on the H.323 protocol cannot be carried
out appropriately. Generally, NAT/NAPT are features that are available with routers.
(NAT/NAPT enabled)
Note
If the router on the network supports the "H.323 NAT" feature, it may be possible to have VoIP
communications over the network. For more information, consult your network administrator.
IP Network
Global IP Address Domain
Router
Local IP Address Domain
A1 VoIP Requirements
Getting Started 49