ZyXEL Communications P-2002 Chapter, Chapter, Introduction to VoIP

P-2002 Series User’s Guide

3.2	General Setup ....................................................................................................	35
	3.2.1 Domain Name ...........................................................................................	35
3.3	General Setup Configuration ..............................................................................	35
3.4	Configuring Password ........................................................................................	36
3.5	Pre-defined NTP Time Servers List ....................................................................	37
3.6	Configuring Time Setting ....................................................................................	37
Chapter 4
Ethernet Screens....................................................................................................		41
4.1 ETHERNET Overview ........................................................................................		41
	4.1.1 IP Address and Subnet Mask ...................................................................	41
	4.1.2 DNS Server Address Assignment .............................................................	41
	4.1.3 PPPoE Encapsulation ...............................................................................	42
4.2	Configuring Ethernet ..........................................................................................	42
4.3	Configuring the Ethernet Management Port .......................................................	44
Chapter 5
Introduction to VoIP ...............................................................................................		45
5.1	Introduction to VoIP ............................................................................................	45
5.2	Introduction to SIP ..............................................................................................	45
	5.2.1 SIP Identities .............................................................................................	45
	5.2.1.1 SIP Number .....................................................................................	45
	5.2.1.2 SIP Service Domain ........................................................................	45
	5.2.2 SIP Call Progression .................................................................................	46
	5.2.3 SIP Servers ...............................................................................................	46
	5.2.3.1 SIP User Agent ...............................................................................	46
	5.2.3.2 SIP Proxy Server .............................................................................	47
	5.2.3.3 SIP Redirect Server ........................................................................	47
	5.2.3.4 SIP Register Server ........................................................................	48
	5.2.4 RTP ...........................................................................................................	48
5.3	NAT ....................................................................................................................	48
	5.3.1 NAT Example ............................................................................................	49
	5.3.2 NAT Types ................................................................................................	49
	5.3.2.1 Full Cone NAT .................................................................................	50
	5.3.2.2 Restricted Cone NAT .......................................................................	51
	5.3.2.3 Port Restricted Cone NAT ...............................................................	52
	5.3.2.4 Symmetric NAT ...............................................................................	52
5.4	NAT and SIP ......................................................................................................	53
	5.4.1 SIP ALG ....................................................................................................	53
	5.4.2 Use NAT Address on SIP and RTP ..........................................................	53
	5.4.3 STUN ........................................................................................................	54
	5.4.4 Outbound Proxy ........................................................................................	54
5.5	Pulse Code Modulation ......................................................................................	54

12 Table of Contents