Panasonic Hybrid IP-PBX, Manual

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2.1 VoIP Requirements
14 Information about IP Proprietary Telephones
Does the router not use network address translation (NAT/NAPT)?
If the router uses address translation techniques (e.g., NAT/NAPT) to convert between global and local IP
addresses, VoIP communications between the IP-EXT16 card and IP-PT cannot be carried out effectively.
Therefore, the routers used to access the IP network must not use NAT/NAPT. Generally, NAT and NAPT
are features that are available with routers.
Router Router
Router Router
Global IP Address
Domain
Local IP Address
Domain Local IP Address
Domain
Local IP Address
Domain
Using NAT/NAPT NOT Using NAT/NAPT
IP Network IP Network