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Campus Wireless Networks Validated Reference Design Version 3.3 | Design Guide Voice over Wi-Fi | 61
simultaneous voice calls handled by a single AP must be limited. This limit varies based on network
conditions and handset manufacturer, and is typically provided in a manufacturer’s design guidelines.
Call admission control (CAC) is included with the Voice Services Module license. CAC lets the Mobility
Controller limit the number of voice calls on an AP, and proactively move voice clients to a less-utilized
AP. Aruba Mobility Controllers implement CAC by statefully following voice protocols and being aware
of the voice utilization of a given AP. Per-SSID association limits for each AP also prevent a voice
device from associating to a dedicated voice SSID when that AP has reached a pre-configured limit.
Comprehensive Voice Management
The Voice Services Module license adds extensive voice management functionality, providing detailed
reporting and troubleshooting capabilities. Information is available at a glance via well-organized tables
and graphs. Some of the capabilities include:
z Phone number association – SIP devices can be tracked and displayed by their associated phone
number.
z Call quality tracking – Automatically calculates, displays and tracks the R-value for each SIP call
being processed through the Aruba mobility controller.
z SIP authentication tracking – Tracks the registration of SIP devices with a IP PBX to determine if
they are authenticated devices.
z Call detail records (CDRs) – Displays the calls made to or from Wi-Fi clients, including originator,
terminator, termination reason, rejected and failed calls, duration, call quality, etc.
z CAC-based real-time information – Quickly determine call density, CAC state, and active calls.