Prestige 2602RL-D3A Support Notes
All contents copyright (c) 2007 ZyXEL Communications Corporation.
5
What is voice quality? ...................................................................................................................................................... 142
How are voice quality normally rated?............................................................................................................................. 142
What is codec? ................................................................................................................................................................. 143
What is the relation of codec and VoIP? .......................................................................................................................... 143
What codec does Prestige support? ................................................................................................................................. 143
Which codec should I choose? .......................................................................................................................................... 143
What do I need in order to use SIP? ................................................................................................................................. 143
Unable to register with the SIP server? ............................................................................................................................ 144
I can register but can not establish a call? ....................................................................................................................... 144
I can make a call but the voice only goes one way not bothway? .................................................................................... 144
I can receive a call but the voice only goes one way not bothway? ................................................................................. 144
If all the about have been tried, but register still fail what should I do? .......................................................................... 145
I suspect there is a hardware problem with my Prestige what should I do? .................................................................... 145
F
IREWALL
FAQ .......................................................................................................................................................................... 145
What is a network firewall? ............................................................................................................................................. 145
What makes Prestige firewall secure? ............................................................................................................................. 145
What are the basic types of firewalls? ............................................................................................................................. 146
What kind of firewall is the Prestige? ............................................................................................................................... 146
Why do you need a firewall when your router has packet filtering and NAT built-in? ..................................................... 147
What is Denials of Service (DoS)attack? ........................................................................................................................... 147
What is Ping of Death attack? .......................................................................................................................................... 147
What is Teardrop attack? ................................................................................................................................................. 147
What is SYN Flood attack? ................................................................................................................................................ 147
What is LAND attack? ....................................................................................................................................................... 148
What is Brute-force attack? ............................................................................................................................................. 148
What is IP Spoofing attack?.............................................................................................................................................. 148
What are the default ACL firewall rules in Prestige? ........................................................................................................ 148
How can I protect against IP spoofing attacks? ............................................................................................................... 149
C
ONTENT
F
ILTER
FAQ ................................................................................................................................................................. 150
TROUBLE SHOOTING...........................................................................................................................................................150
U
SING
E
MBEDDED
P
ACKET
T
RACE
................................................................................................................................................. 150
D
EBUG
PPP
O
E
C
ONNECTION
....................................................................................................................................................... 165
CLI COMMAND LIST ............................................................................................................................................................ 176
