Client Roaming; Call Admission Control - Cisco 8800 Series Deployment Manual

Individual access points can be configured to override the global setting to use dynamic channel and transmit power assignment
for either 5 or 2.4 GHz depending on which frequency band is to be utilized.
Other access points enabled can be enabled for Auto RF and workaround the access points that are statically configured.
This may be necessary if there is an intermittent interferer present in an area.
The 5 GHz channel width can be configured for 20 MHz or 40 MHz if using Cisco 802.11n Access Points and 20 MHz, 40
MHz, or 80 MHz if using Cisco 802.11ac Access Points.
It is recommended to use channel bonding only if using 5 GHz.

Client Roaming

The Cisco IP Phone 8800 Series does not utilize the RF parameters in the Client Roaming section of the Cisco Unified Wireless
LAN Controller as scanning and roaming is managed independently by the phone itself.

Call Admission Control

It is recommended to enable Admission Control Mandatory for Voice and configure the maximum bandwidth and reserved
roaming bandwidth percentages for either 5 or 2.4 GHz depending on which frequency band is to be utilized.
The maximum bandwidth default setting for voice is 75% where 6% of that bandwidth is reserved for roaming clients.
Roaming clients are not limited to using the reserved roaming bandwidth, but roaming bandwidth is to reserve some bandwidth
for roaming clients in case all other bandwidth is utilized.
If CAC is to be enabled, will want to ensure Load-based CAC is enabled, which is available for the Cisco Unified Wireless
LAN Controller, but not currently available on the Cisco Autonomous Access Point platform.
Load-based CAC will account for all energy on the channel.
SIP CAC can help ensure that downstream voice frames are prioritized correctly when a client does not support TSPEC.
Cisco IP Phone 8800 Series Wireless LAN Deployment Guide
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