Call admission control

Description

This module monitors the Voice-over-IP bandwidth and optionally reject calls if the provisioned bandwidth is exceeded.

Release notes

Module configuration interface

Module configuration parameters

This module assumes all the VoIP traffic goes through the SOP where the module is installed (i.e. re-invite procedure is not supported).

• Maximum VoIP bandwidth (bits/s) : The maximum amount of Voice over IP bandwidth acceptable before taking an action to reject calls.
• Restrict calls : Whether or not to hangup new calls when the maximum VoIP bandwidth is about to be exceeded.

The VoIP traffic is defined as the combination of 2 filters. The site filter and the VoIP filter (see infra):

• VoIP filter (example 'udp') : The VoIP filter indicates the traffic considered as VoIP traffic. This will depend on the QoS rules applied by your provider. Typically 'udp' is a good approximation as VoIP protocols are the essential protocols which use udp and go through the SOP.
• Site filter (example: 172.16.35.0/24) : The site filter indicates the traffic monitored by the SOP where the module is installed. Typically it is the LAN where the SOP is installed expressed as a network address and mask.

The module generates 2 new attributes of the class 'flow' and attribute 'bandwidth' which can be monitored through the Advanced Historical Reporting:

• VOIP_TX: amount of VoIP bandwidth in bits/s which leaves the site (as indicated by the site filter).
• VOIP_RX: amount of VoIP bandwidth in bits/s which enters the site (as indicated by the site filter).

Sop shell plugins

4 plugin menus are available in the sop shell:

• Start call admission process
• Stop call admission process
• View bandwidth usage log file
• View call admission actions