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Prestige 2602H-6xC Support Notes
All contents copyright (c) 2005 ZyXEL Communications Corporation.
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What DDNS servers does the Prestige support?........................................112
What is DDNS wildcard?...........................................................................112
Does the Prestige support DDNS wildcard?..............................................112
Can the Prestige SUA handle IPsec packets sent by the VPN gateway
behind Prestige?.........................................................................................112
How do I setup my Prestige for routing IPsec packets over SUA? ...........113
VoIP FAQ...........................................................................................................113
What is Voice over IP? ..............................................................................113
How does Voice over IP work? .................................................................113
Why use VoIP? ..........................................................................................113
What is the relationship between codec and VoIP?...................................114
What advantage does Voice over IP can provide?.....................................114
What is the difference between H.323 and SIP?........................................114
Can H.323 and SIP interoperate with one another?...................................114
What is voice quality?................................................................................114
How are voice quality normally rated?......................................................114
What is codec?...........................................................................................115
What is the relation of codec and VoIP? ...................................................115
What codec does Prestige support?............................................................115
Which codec should I choose?...................................................................115
What do I need in order to use SIP? ..........................................................115
Unable to register with the SIP server?......................................................116
I can register but can not establish a call?..................................................116
I can make a call but the voice only goes one way not bothway? .............116
I can receive a call but the voice only goes one way not bothway? ..........116
If all the about have been tried, but register still fail what should I do?....117
I suspect there is a hardware problem with my Prestige what should I do?117
Firewall FAQ .....................................................................................................117
What is a network firewall?.......................................................................117
What makes Prestige firewall secure? .......................................................117
What are the basic types of firewalls? .......................................................118
What kind of firewall is the Prestige?........................................................118
Why do you need a firewall when your router has packet filtering and
NAT built-in?.............................................................................................119
What is Denials of Service (DoS)attack?...................................................119
What is Ping of Death attack?....................................................................119
What is Teardrop attack? ...........................................................................119