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695 | VoiceandVideo DellPowerConnectW-SeriesArubaOS6.2 | User Guide
Understanding VoIP Call Admission Control Profile
VoIP call admission control prevents any single AP from becoming congested with voice calls. You configure call
admission control options in the VoIP Call Admission Control profile which you apply to an AP group or a specific
AP.
You can use the WebUI or CLI to configure a VoIP Call Admission Control profile.
In the WebUI
1. Navigate to the Configuration > AP Configuration page. Select either AP Group or AP Specific.
l If you select AP Group, click Edit for the AP group name for which you want to configure VoIP CAC.
l If you select AP Specific, select the name of the AP for which you want to configure VoIP CAC.
2. In the Profiles list, expand the QoS menu, then select the VoIP Call Admission Control profile.
3. In the Profile Details window pane, click the VoIP Call Admission Control profile drop-down list and select the
profile you want to edit.
-or-
To create a new profile, click the VoIP Call Admission Control profile drop-down list and select New. Enter a
new profile name in the field to the right of the drop-down list. You cannot use spaces in VoIP profile names.
4. Configure your desired VoIP Call Admission Control profile settings. Table 299 describes the parameters you can
configure in this profile.
Parameter Description
VoIP Call Admission Control Select the Voip Call Admission Control checkbox to enable Wi-Fi VoIP Call
Admission Control features.
VoIP Bandwidth based CAC Select the VoIP Bandwidth based CAC checkbox 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. The
default value is 10. 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.
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. The default value is 2000 kbps.
VoIP Call Handoff Reservation Specify the percentage of call capacity reserved for mobile VoIP clients on an active
call. The 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 checkbox 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 the
Table 299:
VoIP Call Admission Control Configuration Parameters