3Com 3C10111C - NBX 100 - Modular Exp Base, Руководство по установке, Страница: 154 / 210

154 C
HAPTER
9: C
ONFIGURING
IP T
ELEPHONY
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 subnetwork as the Call
Processor.
You do not need to use IP in this environment. Devices always use
Ethernet (Layer 2) communications, and the Call Processor never
needs to give out an IP address.
■
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 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 subnetwork.
Devices on the same subnetwork 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 156 .
3C10165D E1 and 3C10116D T1 Digital Line Cards do not support the
NBX IP On-the Fly feature. If your system uses IP On-the-Fly, then you
must assign a static IP address to the card or use DHCP to assign an IP
address to the card, even if the card will be installed on the same subnet
as the NCP.
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. See Chapter 10, Troubleshooting, in the
NBX
Administrator’s Guide for instructions on how to use the telephones
Local User Interface (LUI) utility.
■
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.