P2302R-P1C Support Notes
What is codec?
Codec is a algorithm which converts analog signal into digital signal and vice versa. There are three main type of waveform codec, source codec, and hybrid codec. Each consume different amount of bandwidth and provide different voice quality level.
What is the relation of codec and VoIP?
As VoIP is a 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 bandwidthwise aspect the smaller amount of bandwidth used the better. But in voice aspect the higher quality the better.
What codec does the ZyXEL Device support?
The ZyXEL Device supports the following commonly used codec.
∙G.729 voice codec
∙
∙
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 .
What do I need in order to use SIP?
The minimum required to use VoIP is as follow.
1.A
2.A PC with VoIP software installed or a hardware VoIP box such as ATA or device like
3.An account with a VoIP provider such as an ITSP. The account can be configured to recognize your calls automatically, or you can require the users to enter their unique account numbers issued.
114
All contents Copyright © 2007 ZyXEL Communications Corporation.
