ZyXEL Communications 2002 Series Chapter, Chapter, Introduction to VoIP

Prestige 2002 Series User’s Guide

3.4	Configuring Password ........................................................................................	30
3.5	Pre-defined NTP Time Servers List ....................................................................	31
3.6	Configuring Time Setting ....................................................................................	32
Chapter 4
Ethernet Screens....................................................................................................		35
4.1 ETHERNET Overview ........................................................................................		35
	4.1.1 IP Address and Subnet Mask ...................................................................	35
	4.1.2 DNS Server Address Assignment .............................................................	35
	4.1.3 PPPoE Encapsulation ...............................................................................	36
4.2	Configuring Ethernet ..........................................................................................	36
4.3	Configuring the Ethernet Management Port .......................................................	38
Chapter 5
Introduction to VoIP ...............................................................................................		39
5.1	Introduction to VoIP ............................................................................................	39
5.2	Introduction to SIP ..............................................................................................	39
	5.2.1 SIP Identities .............................................................................................	39
	5.2.1.1 SIP Number .....................................................................................	39
	5.2.1.2 SIP Service Domain ........................................................................	39
	5.2.2 SIP Call Progression .................................................................................	40
	5.2.3 SIP Servers ...............................................................................................	40
	5.2.3.1 SIP User Agent Server ....................................................................	40
	5.2.3.2 SIP Proxy Server .............................................................................	41
	5.2.3.3 SIP Redirect Server ........................................................................	41
	5.2.3.4 SIP Register Server ........................................................................	42
	5.2.4 RTP ...........................................................................................................	42
5.3 STUN .................................................................................................................		42
	5.3.1 NAT ...........................................................................................................	42
	5.3.2 NAT Types ................................................................................................	43
	5.3.2.1 Full Cone NAT .................................................................................	43
	5.3.2.2 Restricted Cone NAT .......................................................................	44
	5.3.2.3 Port Restricted Cone NAT ...............................................................	44
	5.3.2.4 Symmetric NAT ...............................................................................	45
5.4	SIP ALG .............................................................................................................	46
5.5	Pulse Code Modulation ......................................................................................	46
5.6	Voice Coding ......................................................................................................	46
	5.6.1 G.711 .........................................................................................................	46
	5.6.2 G.729 ........................................................................................................	46
5.7	PSTN Call Setup Signaling ................................................................................	46

8 Table of Contents