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.

If you select AP Group, click Edit for the AP group name for which you want to configure VoIP CAC. 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.

Table 299: VoIP Call Admission Control Configuration Parameters

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-tryingmessages 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

 

 

695 Voice and Video

Dell PowerConnect W-Series ArubaOS 6.2 User Guide

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Dell 6.2 manual Understanding VoIP Call Admission Control Profile

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