ZyXEL Communications 2602HWL-D3A manual Ip Faq

Prestige 2602HWL-D3A Support Notes

Can I receive incoming PSTN call through P2602HWL- 6xC?	183
Can I make an outgoing PSTN call through P2602HWL – 6xC?	184
VOIP FAQ	184
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
FIREWALL FAQ	188
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
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All contents copyright (c) 2007 ZyXEL Communications Corporation.