ZyXEL Communications P-2602H 16

Table of Contents

12.8.4 Call Progression .....................................................................................................		185
12.9	VoIP Trunking Example: PSTN to PSTN via VoIP ...........................................................	185
12.9.1 Background Information .........................................................................................		186
12.9.2 Configuration Details: Outgoing .............................................................................		186
12.9.3 Configuration Details: Incoming .............................................................................		188
12.9.4 Call Progression .....................................................................................................		188
Chapter 13
Phone Usage .........................................................................................................................		191
13.1	Dialing a Telephone Number ...........................................................................................	191
13.2	Using Speed Dial to Dial a Telephone Number ...............................................................	191
13.3	Internal Calls ....................................................................................................................	191
13.4	Using Call Park and Pickup .............................................................................................	191
13.5	Checking the ZyXEL Device’s IP Address .......................................................................	192
13.6	Auto Provisioning and Auto Firmware Upgrade ..............................................................	192
13.7	Phone Functions Summary .............................................................................................	192
Chapter 14
Firewalls.................................................................................................................................		195
14.1	Firewall Overview ...........................................................................................................	195
14.2	Types of Firewalls ............................................................................................................	195
14.2.1 Packet Filtering Firewalls .......................................................................................		195
14.2.2 Application-level Firewalls ......................................................................................		196
14.2.3 Stateful Inspection Firewalls ..................................................................................		196
14.3	Introduction to ZyXEL’s Firewall ......................................................................................	196
14.3.1 Denial of Service Attacks .......................................................................................		197
14.4	Denial of Service .............................................................................................................	197
14.4.1 Basics .....................................................................................................................		197
14.4.2 Types of DoS Attacks .............................................................................................		198
14.5	Stateful Inspection ...........................................................................................................	200
14.5.1 Stateful Inspection Process ....................................................................................		201
14.5.2 Stateful Inspection on Your ZyXEL Device .............................................................		202
14.5.3 TCP Security ..........................................................................................................		202
14.5.4 UDP/ICMP Security ................................................................................................		203
14.5.5 Upper Layer Protocols ...........................................................................................		203
14.6	Guidelines for Enhancing Security with Your Firewall .....................................................	204
14.6.1 Security In General ................................................................................................		204
14.7	Packet Filtering Vs Firewall .............................................................................................	205
14.7.1 Packet Filtering: .....................................................................................................		205
14.7.2 Firewall ...................................................................................................................		205
Chapter 15
Firewall Configuration ..........................................................................................................		207

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16	P-2602H(W)(L)-DxA User’s Guide