3Com 3C10200 NBX Installation Guide - Page 138
Adding a Remote Telephone, NBX Administrator's Guide.
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138 CHAPTER 3: TELEPHONES AND ATTENDANT CONSOLES Figure 37 3105 Attendant Console Label Cover Tabs Adding a Remote Telephone NBX system software (release R4.2 and higher) supports Network Address Port Translation (NAPT, also called NAT overloading). NAPT allows you to put a 3Com Telephone behind a device that applies network address translation at a remote location, such as a home office, and connect to the NBX NCP through an Internet connection. One typical configuration is to connect a cable/DSL modem to a small office/home office router that includes a firewall and Ethernet ports. You connect the 3Com Telephone directly to one of the Ethernet ports. Another option is use the pcXset soft telephone application instead of a 3Com Telephone. For information about installing a remote telephone, see Chapter 3, "Device Configuration," in the NBX Administrator's Guide.