Users Guide

Table Of Contents
4. Configure your desired VoIP Call Admission Control profile settings. Table 213 describes the parameters
you can configure in this profile:
Parameter Description
VoIP Call Admission Control Select the Voip Call Admission Control check box to enable Wi-Fi VoIP
Call Admission Control features.
VoIP Bandwidth based CAC Select the VoIP Bandwidth based CAC check box to enable call
admission controls based upon bandwidth. If this option is not selected,
call admission controls are based on call counts.
VoIP Call Capacity The maximum number of simultaneous calls that the AP radio can
handle. You can use the bandwidth calculator in the WebUI to calculate
the call capacity. To access the bandwidth calculator, navigate to
Configuration > Management > Bandwidth Calculator. Default
value: 10.
VoIP Bandwidth Capacity
(kbps)
Enter a rate from 1 to 600000 (inclusive) to specify the maximum
bandwidth rate that a radio can handle, in kbps. Default value is 2000
kbps.
VoIP Call Handoff Reservation Specify the percentage of call capacity reserved for mobile VoIP clients
on an active call. Default value is 20%.
VoIP Send SIP 100 Trying The SIP invite call setup message is time-sensitive, as the originator
retries the call as quickly as possible if it does not proceed. You can
direct the controller to immediately reply to the call originator with a “SIP
100 - trying” message to indicate that the call is proceeding and to avoid
a possible timeout. This is useful in conditions where the SIP invite may
be redirected through a number of servers before reaching the
controller.
Select the VoIP Send SIP 100 Trying check box to send "SIP 100-trying"
messages to a call originator to indicate that the call is proceeding. This
is a useful option when the SIP invite is directed through many servers
before reaching the controller.
VoIP Disconnect Extra Call In the VoIP Call Admission Control (CAC) profile, you can limit the
number of active voice calls allowed on a radio. This feature is disabled
by default. When you enable the disconnect extra call feature, the
system monitors the number of active voice calls, and if the defined
threshold is reached, any new calls are disconnected. The AP denies
association requests from a device that is on call.
To enable this feature, select the VoIP Disconnect Extra Call check
box. You also need to enable call admission control in this profile.
VOIP TSPEC Enforcement A WMM client can send a Traffic Specification (TSPEC) signaling request
to the AP before sending traffic of a specific AC type, such as voice. You
can configure the controller so that the TSPEC signaling request from a
client is ignored if the underlying voice call is not active. This feature is
disabled by default. If you enable this feature, you can also configure the
time duration within which the station should start the voice call after
sending the TSPEC request (the default is one second).
Table 213: VoIP Call Admission Control Configuration Parameters
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