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.
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
18 IP Networking Guide Document Version 2010-08
2.1.2 Network Configuration
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