Panasonic KX-HTS Series Manual page 68

3.9 PC Connection
Connection via Internet
CAUTION
It is strongly recommended to use TLS encrypted communication when the PC is accessing the PBX via
the Internet. To use TLS encryption, routers must have a port set up for https communication.
Notice
To access the PBX via the internet, routers must have static NAT/NAPT settings (Port forwarding) enabled.
Note
For details about connecting a switching hub to the PBX, refer to "3.12 LAN Connection"