ZyXEL Communications PRESTIGE 2000W V2, Руководство пользователя

Страница: 79 / 131

P-2000W_V2 User’s Guide
Chapter 12 User Web Configurator Screens 79
12.9 VoIP Introduction
VoIP (Voice over IP) is the sending of voice signals over the Internet Protocol. This allows you
to make phone calls and send faxes over the Internet at a fraction of the cost of using the
traditional circuit-switched telephone network. You can also use servers to run telephone
service applications like PBX services and voice mail. Internet Telephony Service Provider
(ITSP) companies provide VoIP service. A company could alternatively set up an IP-PBX and
provide it’s own VoIP service.
Circuit-switched telephone networks require 64 kilobits per second (kbps) in each direction to
handle a telephone call. VoIP can use advanced voice coding techniques with compression to
reduce the required bandwidth.
12.9.1 SIP
The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol that
handles the setting up, altering and tearing down of voice and multimedia sessions over the
Internet.
SIP signaling is separate from the media for which it handles sessions. The media that is
exchanged during the session can use a different path from that of the signaling. SIP handles
telephone calls and can interface with traditional circuit-switched telephone networks.
12.9.1.1 SIP Identities
A SIP account uses an identity (sometimes referred to as a SIP address). A complete SIP
identity is called a SIP URI (Uniform Resource Identifier). A SIP account's URI identifies the
SIP account in a way similar to the way an e-mail address identifies an e-mail account. The
format of a SIP identity is SIP-Number@SIP-Service-Domain.
12.9.1.1.1 SIP Number
The SIP number is the part of the SIP URI that comes before the “@” symbol. A SIP number
can use letters like in an e-mail address (johndoe@VoIP-provider.com for example) or
numbers like a telephone number (1122334455@VoIP-provider.com for example).
MAC Address Every Ethernet device has a unique MAC (Media Access Control) address.
Your Prestige’s MAC address is assigned at the factory and consists of six pairs of
hexadecimal characters, for example, 00:A0:C5:00:00:02.
This field is read only and cannot be configured.
DNS Server IP This field displays the IP address of the DNS server for translating readable
domain names into valid computer IP addresses.
Second DNS
Server IP
This field displays the IP address of the backup DNS server for the Prestige to use
in the event that the Prestige cannot connect to the preferred DNS.
APPLY Click APPLY to save your changes without restarting the Prestige. Your wireless
LAN, Internet and SIP settings changes do not take affect until you use RESTART
(in the navigation panel).
CANCEL Click CANCEL to begin configuring this screen afresh.
Table 9 PPPoE (continued)
LABEL DESCRIPTION