ZyXEL Communications 2000W manual VoIP Introduction, 12.9.1 SIP, SIP Identities, PPPoE

	Prestige 2000W_V2 User’s Guide
Table 9 PPPoE (continued)
LABEL	DESCRIPTION
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	This field displays the IP address of the backup DNS server for the Prestige to use
Server IP	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.

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.

12.9.1.1.1SIP 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@your-ITSP.com for example) or numbers like a telephone number (1122334455@VoIP-provider.com for example).

Chapter 12 User Web Configurator Screens 77