ZyXEL Communications 2602RL-D3A manual Trouble Shooting

Prestige 2602RL-D3A Support Notes

What is voice quality?	142
How are voice quality normally rated?	142
What is codec?	143
What is the relation of codec and VoIP?	143
What codec does Prestige support?	143
Which codec should I choose?	143
What do I need in order to use SIP?	143
Unable to register with the SIP server?	144
I can register but can not establish a call?	144
I can make a call but the voice only goes one way not bothway?	144
I can receive a call but the voice only goes one way not bothway?	144
If all the about have been tried, but register still fail what should I do?	145
I suspect there is a hardware problem with my Prestige what should I do?	145
FIREWALL FAQ	145
What is a network firewall?	145
What makes Prestige firewall secure?	145
What are the basic types of firewalls?	146
What kind of firewall is the Prestige?	146
Why do you need a firewall when your router has packet filtering and NAT built-in?	147
What is Denials of Service (DoS)attack?	147
What is Ping of Death attack?	147
What is Teardrop attack?	147
What is SYN Flood attack?	147
What is LAND attack?	148
What is Brute-force attack?	148
What is IP Spoofing attack?	148
What are the default ACL firewall rules in Prestige?	148
How can I protect against IP spoofing attacks?	149
CONTENT FILTER FAQ	150
TROUBLE SHOOTING	150
USING EMBEDDED PACKET TRACE	150
DEBUG PPPOE CONNECTION	165
CLI COMMAND LIST	176

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