ZyXEL Communications P-2301R/RL-P1C Support Notes page 4

What DDNS servers does the ZyXEL device support? ...............................91
What is DDNS wildcard?.............................................................................91
Does the ZyXEL device support DDNS wildcard? .....................................91
Can the ZyXEL device SUA handle IPsec packets sent by the VPN
gateway behind Prestige?.............................................................................91
How do I setup my Prestige for routing IPsec packets over SUA? .............92
VoIP FAQ .............................................................................................................92
What is Voice over IP? ................................................................................92
How does Voice over IP work? ...................................................................92
Why use VoIP? ............................................................................................92
What is the relationship between codec and VoIP?.....................................93
What advantage does Voice over IP can provide?.......................................93
What is the difference between H.323 and SIP?..........................................93
Can H.323 and SIP interoperate with one another?.....................................93
What is voice quality?..................................................................................93
How are voice quality normally rated?........................................................93
What is codec? .............................................................................................94
What is the relation of codec and VoIP? .....................................................94
What codec does Prestige support?..............................................................94
Which codec should I choose?.....................................................................94
What do I need in order to use SIP? ............................................................94
Unable to register with the SIP server?........................................................95
I can register but can not establish a call?....................................................95
I can make a call but the voice only goes one way not bothway? ...............95
I can receive a call but the voice only goes one way not bothway? ............95
If all the about have been tried, but register still fail what should I do?......95
I suspect there is a hardware problem with my Prestige what should I do? 96
Trouble Shooting ........................................................................................................96
Unable to Get WAN IP from ISP .........................................................................96
Using Embedded Packet Trace ..........................................................................100
Debug PPPoE Connection .................................................................................115
CLI Command List..................................................................................................126
All contents Copyright (c) 2007 ZyXEL Communications Corporation.
Prestige 2301R/RL-P1C Support Notes
4