User guide

Chapter 25: Enterprise VoIP Network Management
332 MAXCS ACC 6.5 Administration Manual
Make your changes or additions, and click Apply. These are the fields in the Codec
configuration window:
Parameter Description
Codec Profile Table Lists codec profiles by name. Select a profile in the
table to modify its settings, then click Apply in the
panel where you made the changes.
Click the Add button to add a codec profile. Click the
Remove button to remove the selected profile. You
cannot remove the Default profile.
Name Name of the codec profile. You can modify the name,
and click Apply. The Default profile name cannot be
changed.
Codec There are several options:
• G.711 Mu-Law
• Prefer G.723.1, support G.729
• Prefer G.729, support G.723.1
• G.711 A-Law
• Prefer G.711 Mu-Law, support G.711 A-Law
• Prefer G.711 A-Law, support G.711 Mu-Law
G.711 provides toll quality digital voice encoding,
and G.723 and G.729 use low rate audio encoding
to provide near toll quality performance under clean
channel conditions.
G.711/G.723/G.729
Silence Suppression
When silence suppression is enabled, and silence is
detected during a call, MAXCS stops sending packets
to the other side. This decreases the bandwidth
requirement, however the voice quality may be
degraded slightly. These are system-wide settings.
G.711/G.723/G.729
Jitter Buffer Range
(ms)
Indicates the delay, in milliseconds, used to buffer
G.711/G.723/G.729 voice packets received from the
IP network. Voice packets sent over the IP network
may incur different delays due to network load or
congestion. The jitter buffer helps to smooth out the
delay variation in the arriving voice packets and
maintain voice quality at the receiving end.
The default values for the jitter buffer for G.711 is 10
min. to 100 max milliseconds.
The default values for the jitter buffer for G.723 is 30
min. to 480 max milliseconds.
The default values for the jitter buffer for G.729 is 10
min. to 480 max milliseconds.
G.711 RTP Packet
Length (ms)
Lets you configure the length of the RTP packets for
G.711 in milliseconds. The RTP packet length can be
set to 10, 20 or 30 milliseconds. The smaller the
packet length, the larger the bandwidth required.