Cisco Wireless IP Phone 8821 and 8821-EX Overview
The Cisco Wireless IP Phone 8821 and 8821-EX are the platforms that provide collaboration within enterprises. It brings
together the capabilities of Cisco Unified Communication applications, building upon the solid foundations of Cisco Unified
Communications devices, both wired and wireless.
Cisco’s implementation of 802.11 permits time sensitive applications such as voice and video to operate efficiently across
campus wide wireless LAN (WLAN) deployments. These extensions provide fast roaming capabilities and an almost seamless
flow of multimedia traffic, whilst maintaining security as the end user roams between access points.
It should be understood that WLAN uses unlicensed spectrum, and as a result it may experience interference from other devices
using the unlicensed spectrum. The proliferation of devices in the 2.4 GHz spectrum, such as Bluetooth headsets, Microwave
ovens, cordless consumer phones, means that the 2.4 GHz spectrum may contain more congestion than other spectrums. The 5
GHz spectrum has far fewer devices operating in this spectrum and is the preferred spectrum to operate the Cisco Wireless IP
Phone 8821 and 8821-EX in order to take advantage of the 802.11a/n/ac data rates available.
Despite the optimizations that Cisco has implemented in the Cisco Wireless IP Phone 8821 and 8821-EX, the use of unlicensed
spectrum means that uninterrupted communication can not be guaranteed, and there may be the possibility of voice gaps of up
to several seconds during conversations. Adherence to these deployment guidelines will reduce the likelihood of these voice
gaps being present, but there is always this possibility.
Through the use of unlicensed spectrum, and the inability to guarantee the delivery of messages to a WLAN device, the Cisco
Wireless IP Phone 8821 and 8821-EX is not intended to be used as a medical device and should not be used to make clinical
decisions.
Phone Models
The following Cisco Wireless IP Phone 8821 and 8821-EX models are available.
Below outlines the modes, frequency ranges and channels supported by each model.
Note: 802.11j (channels 34, 38, 42, 46) are not supported.
Channel 14 for Japan is not supported.
Requirements
The Cisco Wireless IP Phone 8821 and 8821-EX are IEEE 802.11a/b/g/n/ac devices that provide voice communications.
The environment must be validated to ensure it meets the requirements to deploy the Cisco Wireless IP Phone 8821 and 8821-
EX.
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