3Com 3C10200 NBX Installation Guide - Page 182

IP On-the-Fly Configuration, Providing the NCP IP Address to Devices

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182 CHAPTER 10: CONFIGURING IP TELEPHONY different subnets, you can configure the DHCP server to pass the IP address of the NCP to the device. See "Providing the NCP IP Address to Devices" on page 182. IP On-the-Fly Configuration The NBX system must be configured differently in each of the following IP On-the-Fly situations: ■ All telephones and devices are on the same subnet as the NCP. You do not need to use IP in this environment. Devices always use Ethernet (Layer 2) communications, and the NCP never needs to give out an IP address. ■ Some telephones are on separate subnets. If you use a DHCP server, verify that the server has enough IP addresses to handle the number of telephones and devices in the NBX system. Optionally, you can configure the DHCP server to pass the IP address of the NCP to DHCP client devices. For an example, see Appendix C, "Configuring Option 184 on a Windows 2000 DHCP Server," in the NBX Administrator's Guide. If you are not using DHCP, you must use the NBX NetSet utility to configure a block of IP addresses for use by IP On-the-Fly devices, and configure the NCP's IP address into each telephone that will be located on a remote subnet. Devices on the same subnet as the NCP are given an IP address only if they need to communicate with a device that is on a different subnet. See "Configuring IP On-the-Fly" on page 184. Providing the NCP IP Address to Devices To provide the IP address of the NCP to devices on other subnetworks, use one of these methods: ■ Program the IP address of the NCP directly into each telephone using the telephone key pad. For devices the 3Com 3100 Entry Telephone, which does not have an LCD display panel, you can use the Telephone Local Configuration application, which you can install on a computer from the NBX Resource Pack. See Chapter 10, Troubleshooting, in the NBX Administrator's Guide for instructions on how to use these tools. ■ Program a custom DHCP option on the DHCP server and configure the server to pass the IP address of the NCP to remote devices through the standard DHCP configuration process.

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182
C
HAPTER
10: C
ONFIGURING
IP T
ELEPHONY
different subnets, you can configure the DHCP server to pass the IP
address of the NCP to the device. See
“
Providing the NCP IP Address to
Devices
”
on
page 182
.
IP On-the-Fly
Configuration
The NBX system must be configured differently in each of the following IP
On-the-Fly situations:
■
All telephones and devices are on the same subnet as the NCP.
You do not need to use IP in this environment. Devices always use
Ethernet (Layer 2) communications, and the NCP never needs to give
out an IP address.
■
Some telephones are on separate subnets.
If you use a DHCP server, verify that the server has enough IP
addresses to handle the number of telephones and devices in the NBX
system. Optionally, you can configure the DHCP server to pass the IP
address of the NCP to DHCP client devices. For an example, see
Appendix C, “Configuring Option 184 on a Windows 2000 DHCP
Server,” in the
NBX Administrator’s Guide.
If you are not using DHCP, you must use the NBX NetSet utility to
configure a block of IP addresses for use by IP On-the-Fly devices, and
configure the NCP’s IP address into each telephone that will be located
on a remote subnet.
Devices on the same subnet as the NCP are given an IP address only if
they need to communicate with a device that is on a different subnet.
See
“
Configuring IP On-the-Fly
”
on
page 184
.
Providing the NCP IP
Address to Devices
To provide the IP address of the NCP to devices on other subnetworks,
use one of these methods:
■
Program the IP address of the NCP directly into each telephone using
the telephone key pad. For devices the 3Com 3100 Entry Telephone,
which does not have an LCD display panel, you can use the Telephone
Local Configuration application, which you can install on a computer
from the NBX Resource Pack. See Chapter 10, Troubleshooting, in the
NBX Administrator’s Guide
for instructions on how to use these tools.
■
Program a custom DHCP option on the DHCP server and configure the
server to pass the IP address of the NCP to remote devices through the
standard DHCP configuration process.