3Com V3000 ANALOG, Руководство по установке

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ONFIGURING
IP T
ELEPHONY
IP Telephony
Overview
You can integrate the NBX system into any network infrastructure
because it can operate at either Layer 2 (Ethernet) or Layer 3 (IP).
For information on configuring an NBS system to run SIP mode, see the
NBX Administrator’s Guide .
If all the telephones in your office connect to the same Local Area
Network (LAN) and you do not have your LAN segmented into
subnetworks, there is little reason to implement IP telephony. Even if your
network includes a few subnetworks, you can configure the routers to
pass NBX Ethernet frames and avoid the need for IP operation. In a more
widely distributed setting with several subnetworks or with a part of the
network distributed over a Wide Area Network (WAN), IP telephony may
be required.
This section covers these topics:
■
Implementing IP
■
Standard IP Configuration
■
IP On-the-Fly Configuration
■
Providing the NCP IP Address to Devices
Implementing IP You can implement IP in one of two ways:
■
Standard IP
All devices receive an IP address, either from a Dynamic Host
Configuration Protocol (DHCP) server or through manual assignment.
■
IP On-the-Fly
Telephones and other devices on the same subnet as the NCP
communicate with other devices on that subnet using Ethernet frames
so they do not need IP addresses. Devices receive an IP address only
when they need to communicate with a device on a different subnet.
The system administrator specifies a list of IP addresses using the NBX
NetSet utility. When a local device needs an IP address, the system
assigns one from the list. Remote devices receive their IP addresses
either through a DHCP server or through manual assignment.