3Com 3C10200 NBX Installation Guide - Page 181

Standard IP Configuration - lcd

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IP Telephony Overview 181 Standard IP Configuration The NBX system must be configured differently in each of the following situations: ■ All telephones and devices are on the same subnetwork as the NCP. If you use Standard IP with a DHCP server, verify that the server has enough IP addresses to handle the number of telephones and devices in the NBX system. If you are not using a DHCP server, use the NBX NetSet utility to configure an IP address for each 3Com telephone and device. ■ Some telephones are on separate subnetworks. If you use a DHCP server, verify that the server has enough IP addresses to handle the number of telephones and devices on the separate subnet. If you connect a new telephone to the subnet, you must provide a means for the telephone to get the IP address of the NCP. You can configure DHCP option 184 on your DHCP server for this purpose. You can manually define network settings for a telephone, including the NCP address, using the Local User Interface (LUI) utility, which resides on each telephone that has an LCD display, or the Telephone Local Configuration application (TLC), a program that you can install from the NBX Resource Pack. For more information on these tools, see Chapter 10, "Troubleshooting," in the NBX Administrator's Guide. Using DHCP A DHCP server can assign IP addresses to telephones from a predefined group of addresses. (The NCP must have a static IP address.) The DHCP server assigns these addresses for a fixed amount of time that depends on how the server is configured. At the end of the time period, if the device is still active and needs the IP address to continue operating, the DHCP server renews the same IP address for another time period. If the device is no longer active at the end of the time period, the DHCP server returns the IP address to the list of available addresses that can be allocated to requesting devices. If your DHCP server can serve multiple subnets (by using a BOOTP Relay agent, also known as an IP helper address), you can provide IP settings (IP address, subnet mask, and default gateway address) for all of your system devices. However, each NBX device in the system must know the IP address of the NCP. If the device and the NCP are located on the same subnet, the device receives this information through status messages passed at the Ethernet layer. If the device and the NCP are located on

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IP Telephony Overview
181
Standard IP
Configuration
The NBX system must be configured differently in each of the following
situations:
■
All telephones and devices are on the same subnetwork as the NCP.
If you use Standard IP with a DHCP server, verify that the server has
enough IP addresses to handle the number of telephones and devices
in the NBX system.
If you are not using a DHCP server, use the NBX NetSet utility to
configure an IP address for each 3Com telephone and device.
■
Some telephones are on separate subnetworks.
If you use a DHCP server, verify that the server has enough IP
addresses to handle the number of telephones and devices on the
separate subnet. If you connect a new telephone to the subnet, you
must provide a means for the telephone to get the IP address of the
NCP. You can configure DHCP option 184 on your DHCP server for this
purpose.
You can manually define network settings for a telephone, including
the NCP address, using the Local User Interface (LUI) utility, which
resides on each telephone that has an LCD display, or the Telephone
Local Configuration application (TLC), a program that you can install
from the NBX Resource Pack. For more information on these tools, see
Chapter 10, “Troubleshooting,” in the
NBX Administrator’s Guide.
Using DHCP
A DHCP server can assign IP addresses to telephones from a predefined
group of addresses. (The NCP must have a static IP address.) The DHCP
server assigns these addresses for a fixed amount of time that depends
on how the server is configured. At the end of the time period, if the
device is still active and needs the IP address to continue operating, the
DHCP server renews the same IP address for another time period. If the
device is no longer active at the end of the time period, the DHCP server
returns the IP address to the list of available addresses that can be
allocated to requesting devices.
If your DHCP server can serve multiple subnets (by using a BOOTP Relay
agent, also known as an IP helper address), you can provide IP settings (IP
address, subnet mask, and default gateway address) for all of your system
devices. However, each NBX device in the system must know the IP
address of the NCP. If the device and the NCP are located on the same
subnet, the device receives this information through status messages
passed at the Ethernet layer. If the device and the NCP are located on