ZyXEL Communications P-2000W V2 manual What is codec?, What is the relation of codec and VoIP?

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P2000W V2 Troubleshooting Guide

Voice quality is most commonly rated through a voice quality metric called the Mean Opinion Score (MOS) which is recommendation by ITU-T. The MOS is a 5 point scale where 5 represent excellent voice quality and 1 represent bad voice quality.

11. What is codec?

Codec is an algorithm which converts analog signal into digital signal and vice versa. There are three main types of waveform codec, source codec, and hybrid codec. Each consume different amount of bandwidth and provide different voice quality level.

12. What is the relation of codec and VoIP?

As VoIP is general term send voice information in digital form in discrete packets over digital network and this digital network is public network, thus there maybe other packet such data packet uses network at the same time. The codec choose is related to how much bandwidth voice packet will consume. In bandwidth wise aspect the smaller amount of bandwidth used the better. But in voice aspect the higher quality the better.

13. Which codec should I choose?

As which codec choose is depending on what codec is supported on both end of the VoIP host. Generally a codec with low bandwidth consumption and high voice quality is a good codec.

14.I have press load default setting from Menu->Setting->Load Default option from the phone cursor but the device seems not fully resetted?

'Load default' is not reset all of the settings. If you press the 'load default', it will reset the Time format, Key lock, Melody, Ring volume, Banner and Vibrator setting to default.

15. How do I reset the device to factory default?

To reset P2000W V2 to default including username/password. Please follow the step as below.

All contents copyright (c) 2005 ZyXEL Communications Corporation.

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Contents 2000W VoIP wireless phonePage Customer Support Frequently Asked Question IntroductionWhat advantage does VoIP can provide? What is VoIP?Why use IP for voice? What is the relationship between codec and VoIP?What do I need in order to use SIP? What is the difference between H.323 and SIP?What is voice quality? Can H.323 and SIP interoperate with one another?Which codec should I choose? What is codec?What is the relation of codec and VoIP? How do I reset the device to factory default?Can P2000W V2 support outbound proxy? What is the P2000W V2 supported Codec?Is it a hardware problem? VoIP TroubleshootingCan P2000W V2 support STUN? If Ive confirmed it is an NAT problem. What should I do? How can I check if problem is cause by NAT or not?Unable to register with the SIP server? Can make a call but the voice only goes one way not bothway? Can register but can not establish a call?P2000W V2 Troubleshooting Guide P2000W V2 Troubleshooting Guide VoIP challenge P2000W V2 Troubleshooting Guide