Prestige 2602HWL-DxA Support Notes
All contents copyright (c) 2005 ZyXEL Communications Corporation. 5
Can H.323 and SIP interoperate with one another?...................................164
What is voice quality?................................................................................164
How are voice quality normally rated?......................................................164
What is codec?........................................................................................... 165
What is the relation of codec and VoIP? ...................................................165
What codec does Prestige support?............................................................165
Which codec should I choose?...................................................................165
What do I need in order to use SIP? ..........................................................165
Unable to register with the SIP server?......................................................166
I can register but can not establish a call?..................................................166
I can make a call but the voice only goes one way not bothway?............. 166
I can receive a call but the voice only goes one way not bothway?.......... 166
If all the about have been tried, but register still fail what should I do?....167
I suspect there is a hardware problem with my Prestige what should I do?167
Firewall FAQ.....................................................................................................167
What is a network firewall?.......................................................................167
What makes Prestige firewall secure?....................................................... 167
What are the basic types of firewalls?....................................................... 168
What kind of firewall is the Prestige?........................................................168
Why do you need a firewall when your router has packet filtering and
NAT built-in?.............................................................................................169
What is Denials of Service (DoS)attack?...................................................169
What is Ping of Death attack?....................................................................169
What is Teardrop attack?........................................................................... 169
What is SYN Flood attack?........................................................................169
What is LAND attack?...............................................................................170
What is Brute-force attack? .......................................................................170
What is IP Spoofing attack?.......................................................................170
What are the default ACL firewall rules in Prestige?................................170
How can I protect against IP spoofing attacks?.........................................171
Content Filter FAQ............................................................................................172
IPSec FAQ.........................................................................................................172
What is VPN? ............................................................................................172
Why do I need VPN?................................................................................. 173
What are most common VPN protocols?...................................................173
What is PPTP?........................................................................................... 173
What is L2TP?........................................................................................... 174