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What is voice quality? .................................................................................. 38
How are voice quality normally rated? ........................................................ 38
What is codec? ............................................................................................. 38
What is the relationship between codec and VoIP? ..................................... 39
What codec types does P-2024 support? ..................................................... 39
Which codec should I choose? ..................................................................... 39
What do I need in order to use SIP? ............................................................ 39
I am unable to register to a SIP server ......................................................... 40
I can register to the SIP server but cannot establish a call ........................... 40
I can make or receive a call but the voice traffic only goes one way, not
both way ....................................................................................................... 40
I have tried all the troubleshooting steps, but still cannot register to the SIP
server. What should I do next? ..................................................................... 40
Trouble Shooting ........................................................................................................ 41
Unable to Get WAN IP from ISP .........................................................................41
Using Embedded Packet Trace ............................................................................45
Debugging PPPoE Connection ............................................................................59
CLI Command List .................................................................................................... 70
All contents copyright (c) 2006 ZyXEL Communications Corporation.
P-2024 Support Notes
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