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134 CHAPTER 3: DEVICE CONFIGURATION
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 an NBX Telephone behind a device that applies network address
translation at a remote location, such as a home office, and connect to
the NBX call processor 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
NBX Telephone directly to one of the Ethernet ports. Another option is
use the pcXset soft telephone application instead of an NBX Telephone.
Remote NAPT Device
Configuration
This section summarizes the tasks you must complete to configure an
NBX Telephone for operation behind the NAPT device. Because the
configuration interface on each device varies, detailed procedures for
NAPT device configuration are beyond the scope of this document. For
information about configuring the NAPT device, see the documentation
for that device.
To add a broadband connected telephone behind a NAPT device:
1 Make sure the NBX system is set up for IP operations, either Standard IP
or IP-on-the-fly. The NBX system must have a public IP address.
2 Use the NBX NetSet utility to enable Auto Discover Telephones and then
connect the NBX Telephone to the NBX system.
Auto discovering the telephone allows the system to configure the phone
in the database and assign an extension number. You could manually add
the telephone to the database instead of using the Auto Discover feature.
3 Move the telephone to its intended location. Connect it to power and
then use the telephone Local User Interface (LUI) utility to program these
settings:
■ NCP MAC address — Required only when the network has more than
one network call processor.
■ Telephone IP address — A private IP address matching the IP address
scheme on the LAN side of the NAPT device but outside of the DHCP
address range configured in the NAPT device. The telephone must
have a static IP address.
■ NCP IP address — The IP address of the call processor that the phone
must communicate with. The NBX system must have a public IP
address.