LevelOne VOI-7011 - Manual (Page 65)

59
Codec Priority Adjust Codec priority to meet your
requirement, lower number shows higher
priority.
RTP Packet
Length Adjust Codec g711, g729 and g723 packet
length
G.723 5.3K Enables 5.3K bit/s rate when use g723
Voice VAD VAD (Voice Activity Detection) is used to
reduce the transmission rate during
inactive speech periods. VAD classifies
the input signal into active speech,
inactive speech or background noise.
Based on the VAD decisions.
One of the most important factors is how much bandwidth is
used for each VoIP call. The higher the CODEC bandwidth is,
the higher the cost of each call across the network will be.
Following is a list of CODECs and their associated bandwidth:
G.711 The G.711 pulse code modulation (PCM) coding scheme
uses the most bandwidth. G.711 takes samples 8000 times per
second, each of which is 8 bits in length, for a total bandwidth
of 64,000 bps.
G.726 The G.726 adaptive differential pulse code modulation
(ADPCM) coding schemes use somewhat less bandwidth.
While each coding scheme takes samples 8000 times per
second like PCM, G.726 ADPCM uses 4, 3, or 2 bits for each