Panasonic KX-NCP500 Manual page 18

2.1.2 Network Configuration
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 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.
Using NAT/NAPT
Local IP Address
Domain
Global IP Address
Domain
Local IP Address
Domain
18 IP Networking Guide
Router
IP Network
Router
NOT Using NAT/NAPT
Local IP Address
Domain
Router
IP Network
Router
Document Version 2009-12