ZyXEL Communications P-2302HWDL-P1 Support Notes page 4

Does the Prestige support DDNS wildcard?................................................93
Can VPN tunnels still work on a Prestige using SUA? ...............................93
How do I set up my Prestige to route IPsec packets over SUA? .................93
VoIP FAQ .............................................................................................................93
What is Voice over IP?.................................................................................93
How does Voice over IP work? ....................................................................94
Why use VoIP?.............................................................................................94
In addition, it would take a much longer time, more effort and money to
implement new features using circuit switching. Since the IP technology is
a standard and various applications are available, it is easier and more
cost-effective to integrate new services and applications using IP. .............94
What is the relationship between codec and VoIP? .....................................94
What advantage does Voice over IP provide?..............................................94
What is the difference between H.323 and SIP?..........................................94
Can H.323 and SIP interoperate with each other? .......................................95
What is voice quality?..................................................................................95
How are voice quality normally rated?........................................................95
What is codec? .............................................................................................95
What is the relationship between codec and VoIP? .....................................95
What codec types does Prestige support? ....................................................95
Which codec should I choose?.....................................................................96
What do I need in order to use SIP? ............................................................96
I am unable to register to a SIP server .........................................................96
I can register to the SIP server but cannot establish a call...........................96
I can make or receive a call but the voice traffic only goes one way, not
both way.......................................................................................................97
I have tried all the troubleshooting steps, but still cannot register to the SIP
server. What should I do next?.....................................................................97
What should I do if there may be a hardware problem with my Prestige?..97
Trouble Shooting ........................................................................................................98
Unable to Get WAN IP from ISP .........................................................................98
Using Embedded Packet Trace ..........................................................................101
Debugging PPPoE Connection ..........................................................................116
CLI Command List..................................................................................................128
All contents copyright (c) 2005 ZyXEL Communications Corporation.
Prestige 2302 Support Notes
4