User manual

4300T User Manual Edgewater Networks, Inc.
Version 1.7 38
Enable Traffic Shaping
A. From the Configuration Menu, select
Traffic Shaper.
B. Select the Enable traffic shaper
checkbox.
Specify the upstream and downstream
bandwidth of your WAN link
C. Enter the WAN Downstream
Bandwidth in Kbps.
D. Enter the WAN Upstream Bandwidth
in Kbps.
Note: For FT1/T1/E1 links the upstream and
downstream bandwidths will always be the same
value (the link is full-duplex).
Optionally enable priority IP addresses
VoIP traffic from devices that use the VoIP ALG function (phones, video stations,
softphones on Pcs, etc.) are already marked as high priority and do not need to be
manually configured in this list. This list is used to prioritize voice traffic from trunk
interfaces of IP PBXs or other high priority devices that do not use the VoIP ALG
function of the 4300T.
E. Enter the IP address of other high priority devices in the priority IP
Addresses box.
You can enter individual IP addresses or a range using by appending a “-“ character
to the last octet. For example, 10.10.10.2-5 would specify 10.10.10.2, 10.10.10.3,
10.10.10.4 and 10.10.10.5 as voice devices.
WARNING: Care must be taken to ensure that the IP addresses entered do
not include data devices such as PCs or workstations. Traffic from these
devices will be placed in the priority voice queue internal to the 4300T and
burst up to full line rate. This will starve actual voice devices by
consuming priority bandwidth and result in dropped calls, busy signals &
poor voice quality.
Enable CAC
The 4300T uses CAC to limit the number of active voice calls over the WAN link. This
is necessary because a typical installation uses a ratio of 1:2 or 1:4 active voice calls
to voice devices on the assumption that 50% or 25% of all users are on the phone at
the same time. These ratios are guidelines only and at times the number of
concurrent calls may exceed the amount of WAN bandwidth available to process the
calls. In this instance existing phone calls will experience poor quality or be dropped
all together. To prevent this from occurring a typical voice installation will set a
threshold for the maximum number of concurrent voice calls supported by the WAN