Panasonic KX-NS1000 Installation Manual page 223

How is the PBX connected to remote extensions?
When the PBX is connected to a remote extensions via public IP network without using IP-VPN, address
translation techniques (e.g., NAT/NAPT) are used. These methods prevent VoIP communications from being
carried out effectively. In such cases, the use of a Session Border Controller (SBC) will avoid this problem.
Note
•
An SBC is not required for:
–
Connections via a Wide Area Ethernet or LAN
–
Connections via IP-VPN
•
An SBC is required for:
–
Connections via a public IP network
Connection via Wide Area Ethernet or LAN
Switching Hub
Wide Area
Ethernet/
LAN
Switching Hub
Local IP Address
Domain
Connection via IP-VPN
Local IP Address
Domain
Global IP Address
Domain
Local IP Address
Domain
7.1.6 Network Configuration
Router
IP-VPN
Router
Installation Manual 223