5-45
3. Set the values for the selected item referring to the following table, and press
[Enter].
No
Item
Description
0
Audio Codec
Selects VoIP Codec.
1. G.711(64K)
2. G.723.1(6.3K)
3. G.729a(8K)
4. G.729 (8K)
1
Echo
Cancellation
Echo Cancellation is the function to remove echo that
is generated by voice reflection on Packet Delay and
PSTN. It enables/disables this function.
2
Silence
Suppression
Silence Suppression is the function to prevent
transmission of voice packet by detecting ‘mute’
during a call. It enables/disables this function.
3
High Pass Filter
Voice filter, which must always be set as ‘Enable’.
4
Post Filter
Voice filter, which must always be set as ‘Enable’.
5
Input Gain
Quality of PCM voice that is input via VoIP DSP. It
sets it to the site environment.
6
Voice Volume
Volume of voice packet when it is PCM processed. It
sets it to the site environment.
7
Multi-Frame
Counter
Sets the buffering number when voice packets are
transmitted to network. The voice packets are buffered
to the set number and set as a single RTP packet.
8
Jitter Optimizing
Factor
Sets the control standard for Jitter Buffering that is
required in the PCM process of received voice packets
from network.
When it is set below 4, it focuses on process of Packet
Loss. When it is set above 4, it focuses on Packet
Delay.
9
RTP Delay Limit
Sets the delay limit on voice packets received through
RTP. When the limit is exceeded during communication, it
is used as a basic index for network error.