ZyXEL Communications P-2304R, Руководство пользователя

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Appendix A Product Specifications
P-2304R-P1 Series User’s Guide
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Firmware Upgrade Download new firmware (when available) from the ZyXEL web site and
use the web configurator, an FTP or a TFTP tool to put it on the ZyXEL
Device.
Note: Only upload firmware for your specific model!
Any IP The Any IP feature allows a computer to access the Internet and the
ZyXEL Device without changing the network settings (such as IP
address and subnet mask) of the computer, when the IP addresses of
the computer and the ZyXEL Device are not in the same subnet.
Configuration Backup &
Restoration
Make a copy of the ZyXEL Device’s configuration and put it back on the
ZyXEL Device later if you decide you want to revert back to an earl i er
configuration.
Network Address
Translation (NAT)
Each computer on your network must have its own unique IP
address.Use NAT to convert a single public IP address to multiple
private IP addresses for the computers on your network.
Port Forwarding If you have a server (mail or web server for example) on your network,
then use this feature to let people access it from the Internet.
DHCP (Dynamic Host
Configuration Protocol)
Use this feature to have the ZyXEL Device assign IP addresses, an IP
default gateway and DNS servers to computers on your network.
Dynamic DNS Support With Dynamic DNS (Domain Name System) support, you can use a
fixed URL, www.zyxel.com for example, with a dynamic IP address. You
must register for this service with a Dynamic DNS service provider.
IP Multicast IP Multicast is used to send traffic to a specific group of computers. The
ZyXEL Device supports versions 1 and 2 of IGMP (Internet Group
Management Protocol) used to join multicast groups (see RFC 2236).
IP Alias IP Alias allows you to subdivide a physical network into logical networks
over the same Ethernet interface with the ZyXEL Device itself as the
gateway for each subnet.
Bridge Mode The ZyXEL Device can act as a bridge, instead of a router. This change
should not require any other changes in your existing network.
SIP ALG The ZyXEL Device is a SIP Application Layer Gateway (ALG). It allows
VoIP calls to pass through NAT for devices behind the ZyXEL Device
(such as a SIP-based VoIP software application on a computer).
Multiple Telephones You can connect more than one telephone to the ZyXEL Device’s
telephone port(s). The Ringer Equivalence Number (REN) is used to
determine the number of devices that may be connected to the
telephone line.
Dynamic Jitter Buffer The ZyXEL Device has a built-in, adaptive buffer that helps to smooth
out the variations in delay (jitter) for voice traffic. This helps ensure good
voice quality for your conversations.
Multiple SIP Accounts The ZyXEL Device allows you to simultaneously use multiple voice (SIP)
accounts and assign them to one or more telephone ports.
STUN Simple Traversal of User Datagram Protocol (UDP) through Network
Address Translators (STUN) allows SIP to pass through NAT routers.
Outbound Proxy Some VoIP service providers use a SIP outbound server to handle voice
calls. This allows the ZyXEL Device to work from behind any type of
NAT router and eliminates the need for STUN or a SIP ALG (Application
Layer Gateway).
Table 111 Firmware Features
FEATURE DESCRIPTION