Cisco Wireless Ip Phone 8821 And 8821-Ex Administration Guide For Cisco Unified Communications Manager - Cisco 8821 Administration Manual

Your Phone
Table 1: Battery Life
Call State
On Call
Idle
Follow these best practices to ensure that the phone conserves battery power.
User Actions
Remind your users that the battery life is reduced when the phone is turned on. Calls, messages, application
use, Bluetooth use, and actions like menu navigation use power.
Users should ensure that the phone remains in a good RF coverage area and that the phone can maintain a
constant connection to the Cisco Unified Communications Manager. If the phone moves out of range and
remains out of range for a significant time, battery life can be reduced.
For more information about RF coverage, see
19.
Phone Configuration
Configure the Scan mode field in Cisco Unified Communications Manager to suit your enterprise. The phone
supports Continuous, Auto, and Single AP scanning, where Continuous is the default. The configured scan
mode determines the battery life baseline.
• Continuous scan mode is designed for phone users that are constantly on the move and for whom frequent
roaming events occur. This mode maximizes performance and connectivity, but at the expense of battery
power.
• Auto scan mode is designed for phone users that only roam occasionally, and whoe require more idle
battery life than Continuous scan mode can offer.
• Single AP scan mode is designed for phone users that do not roam and require maximum idle battery
life.
Access Point Configuration
• For optimal idle battery life, we recommend that you use an access point that supports the Cisco
Compatible Extensions (CCX) Proxy ARP feature. CCX Proxy ARP allows the phone to remain in
suspend mode longer instead of waking up at each DTIM period. This reduces power consumption.
The Cisco Lightweight Access Points and Cisco Autonomous Access Points support CCX Proxy ARP,
but Cisco Meraki Access Points do not.
For Cisco Lightweight Access Points, CCX Proxy ARP is enabled by default and nonconfigurable. For
Cisco Autonomous Access Points, CCX Proxy ARP is disabled by default, but can be enabled with the
dot11 arp-cache optional command.
Scan Mode
Continuous
Auto
Continuous
Auto

Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager

Best Practices for Battery Power Conservation
Expected Battery Time
Up to 13 hours
Up to 13 hours
Up to 48 hours
Up to 170 hours
Cisco Wireless IP Phone 882x Deployment Guide, on page
9