ZyXEL Communications Prestige 2602HWL-D3A Support Manual page 5

Can I receive incoming PSTN call through P2602HWL- 6xC? ............................................................................................ 183
Can I make an outgoing PSTN call through P2602HWL - 6xC? ........................................................................................ 184
V IP FAQ ................................................................................................................................................................................ 184
O
What is Voice over IP? ...................................................................................................................................................... 184
How does Voice over IP work? .......................................................................................................................................... 184
Why use VoIP? .................................................................................................................................................................. 184
What is the relationship between codec and VoIP? ......................................................................................................... 184
What advantage does Voice over IP can provide? ............................................................................................................ 185
What is the difference between H.323 and SIP?............................................................................................................... 185
Can H.323 and SIP interoperate with one another? ......................................................................................................... 185
What is voice quality?....................................................................................................................................................... 185
How are voice quality normally rated? ............................................................................................................................. 185
What is codec? ................................................................................................................................................................. 185
What is the relation of codec and VoIP? ........................................................................................................................... 186
What codec does Prestige support? ................................................................................................................................. 186
Which codec should I choose? .......................................................................................................................................... 186
What do I need in order to use SIP? .................................................................................................................................. 186
Unable to register with the SIP server? ............................................................................................................................ 187
I can register but can not establish a call? ........................................................................................................................ 187
I can make a call but the voice only goes one way not bothway? .................................................................................... 187
I can receive a call but the voice only goes one way not bothway? .................................................................................. 187
If all the about have been tried, but register still fail what should I do? .......................................................................... 187
I suspect there is a hardware problem with my Prestige what should I do? .................................................................... 188
F FAQ .......................................................................................................................................................................... 188
IREWALL
What is a network firewall? .............................................................................................................................................. 188
What makes Prestige firewall secure? .............................................................................................................................. 188
What are the basic types of firewalls?.............................................................................................................................. 188
What kind of firewall is the Prestige? ............................................................................................................................... 189
Why do you need a firewall when your router has packet filtering and NAT built-in?...................................................... 189
What is Denials of Service (DoS)attack? ........................................................................................................................... 190
What is Ping of Death attack? .......................................................................................................................................... 190
What is Teardrop attack? ................................................................................................................................................. 190
What is SYN Flood attack? ................................................................................................................................................ 190
What is LAND attack? ....................................................................................................................................................... 191
What is Brute-force attack? .............................................................................................................................................. 191
What is IP Spoofing attack? .............................................................................................................................................. 191
What are the default ACL firewall rules in Prestige? ........................................................................................................ 191
All contents copyright (c) 2007 ZyXEL Communications Corporation.
Prestige 2602HWL-D3A Support Notes
5