Codec
A CODEC is an algorithm for taking voice or video and compressing the information. This type of codec
combines analog-to-digital conversion and digital-to-analog conversion functions in a single chip. The
Codec is used to compress the voice signal into data packets. Each Codec has different bandwidth
requirement. There are 9 kinds of codec, G.711/Ulaw, G.711/Alaw, G.729, G.723(5.3k / 6.3k bps),
G.726(16K bps), G.726(24K bps), G.726(32K bps), G.726(40K bps)
QoS
The QOS (Quality Of Service) is to guarantee that the SIP and RTP should be transmitting at the same time
and Data couldn’t influence the Voice quality.
The QOS (Quality Of Service) is to guarantee that the Voice and Data should be transmitting at the same
time and Data couldn’t influence the Voice quality. When TOS bits is enabled, it will guarantee the Voice
have the first priority pass through the TOS enable devices.
VLAN Taging
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