Cisco 8821 User manual

Cisco Wireless IP Phone 8821 and 8821-EX
Wireless LAN Deployment Guide
The Cisco Wireless IP Phone 8821 and 8821-EX are adaptable for all mobile professionals, from users on the move within an
office environment to nurses and doctors in a healthcare environment to associates working in the warehouse, on the sales floor,
or in a call center. Staff, nurses, doctors, educators, and IT personnel can be easily reached when mobile.
This guide provides information and guidance to help the network administrator deploy the Cisco Wireless IP Phone 8821 and
8821-EX in a wireless LAN environment.

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
2
Revision History
Date
Comments
08/24/16
11.0(2) Release
10/08/16
11.0(2)SR2 Release
02/07/17
11.0(3) Release

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
3
Contents
Cisco Wireless IP Phone 8821 and 8821-EX Overview ......................................................................................................................... 6!
Phone Models ......................................................................................................................................................................................... 6!
Requirements .......................................................................................................................................................................................... 6!
Site Survey.......................................................................................................................................................................................... 7!
Call Control ........................................................................................................................................................................................ 8!
Wireless LAN..................................................................................................................................................................................... 8!
Protocols............................................................................................................................................................................................... 12!
Wi-Fi ..................................................................................................................................................................................................... 12!
Regulatory ........................................................................................................................................................................................ 15!
Bluetooth............................................................................................................................................................................................... 16!
Languages............................................................................................................................................................................................. 17!
8821-EX Certifications ......................................................................................................................................................................... 17!
Battery Life ........................................................................................................................................................................................... 18!
Phone Care ........................................................................................................................................................................................... 20!
Accessories ........................................................................................................................................................................................... 20!
Wireless LAN Design.............................................................................................................................................................................. 22!
802.11 Network..................................................................................................................................................................................... 22!
5 GHz (802.11a/n/ac) ....................................................................................................................................................................... 22!
2.4 GHz (802.11b/g/n)...................................................................................................................................................................... 23!
Signal Strength and Coverage .......................................................................................................................................................... 24!
Data Rates......................................................................................................................................................................................... 27!
Rugged Environments ...................................................................................................................................................................... 28!
Security ................................................................................................................................................................................................. 30!
Extensible Authentication Protocol - Flexible Authentication via Secure Tunneling (EAP-FAST) ............................................... 31!
Extensible Authentication Protocol - Transport Layer Security (EAP-TLS)................................................................................... 32!
Protected Extensible Authentication Protocol (PEAP) .................................................................................................................... 34!
EAP and User Database Compatibility ............................................................................................................................................ 34!
Quality of Service (QoS)....................................................................................................................................................................... 35!
Call Admission Control (CAC) ........................................................................................................................................................ 35!
Traffic Classification (TCLAS)........................................................................................................................................................ 36!
QoS Basic Service Set (QBSS) ........................................................................................................................................................ 36!
Wired QoS ........................................................................................................................................................................................ 37!
Roaming................................................................................................................................................................................................ 38!
Fast Secure Roaming (FSR) ............................................................................................................................................................. 38!
Interband Roaming ........................................................................................................................................................................... 40!
Scanning ........................................................................................................................................................................................... 40!
Power Management .............................................................................................................................................................................. 40!
Call Capacity ........................................................................................................................................................................................ 41!
Multicast ............................................................................................................................................................................................... 42!
Configuring the Cisco Wireless LAN.................................................................................................................................................... 42!
Cisco Wireless LAN Controller and Lightweight Access Points .......................................................................................................... 42!
802.11 Network Settings .................................................................................................................................................................. 43!
WLAN Settings ................................................................................................................................................................................ 55!
Controller Settings............................................................................................................................................................................ 60!
Call Admission Control (CAC) ........................................................................................................................................................ 62!

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
4
RF Profiles........................................................................................................................................................................................ 65!
FlexConnect Groups......................................................................................................................................................................... 67!
Multicast Direct ................................................................................................................................................................................ 67!
QoS Profiles...................................................................................................................................................................................... 68!
Advanced Settings ............................................................................................................................................................................ 72!
Cisco Meraki Access Points.................................................................................................................................................................. 74!
Creating the Wireless Network ........................................................................................................................................................ 75!
SSID Configuration .......................................................................................................................................................................... 77!
Radio Settings................................................................................................................................................................................... 80!
Traffic Shaping................................................................................................................................................................................. 82!
Monitoring Clients............................................................................................................................................................................ 82!
Cisco Autonomous Access Points ......................................................................................................................................................... 83!
802.11 Network Settings .................................................................................................................................................................. 83!
WLAN Settings ................................................................................................................................................................................ 87!
Call Admission Control (CAC) ........................................................................................................................................................ 97!
QoS Policies ..................................................................................................................................................................................... 98!
Power Management ........................................................................................................................................................................ 101!
Cisco Autonomous Access Point Sample Configuration ............................................................................................................... 102!
Configuring Cisco Call Control........................................................................................................................................................... 107!
Cisco Unified Communications Manager .......................................................................................................................................... 107!
Device Pools................................................................................................................................................................................... 107!
Phone Button Templates................................................................................................................................................................. 108!
Security Profiles ............................................................................................................................................................................. 108!
SIP Profiles..................................................................................................................................................................................... 110!
Common Settings ........................................................................................................................................................................... 113!
QoS Parameters .............................................................................................................................................................................. 113!
G.722 and iSAC Advertisement ..................................................................................................................................................... 114!
Audio Bit Rates .............................................................................................................................................................................. 114!
Wireless LAN Profiles ................................................................................................................................................................... 115!
Cisco Unified Communications Manager Express............................................................................................................................. 124!
Product Specific Configuration Options ............................................................................................................................................ 128!
Configuring the Cisco Wireless IP Phone 8821 and 8821-EX .......................................................................................................... 138!
Wi-Fi Profile Configuration ............................................................................................................................................................... 138!
Automatic Provisioning.................................................................................................................................................................. 138!
Local User Interface ....................................................................................................................................................................... 139!
Admin Webpage............................................................................................................................................................................. 147!
Certificate Management ..................................................................................................................................................................... 150!
Manual Installation......................................................................................................................................................................... 150!
Simple Certificate Enrollment Protocol (SCEP) ............................................................................................................................ 153!
Certificate Removal........................................................................................................................................................................ 186!
Bluetooth Settings ............................................................................................................................................................................... 186!
Upgrading Firmware.......................................................................................................................................................................... 188!
Troubleshooting .................................................................................................................................................................................... 189!
WLAN Signal Indicator....................................................................................................................................................................... 189!
Neighbor List ...................................................................................................................................................................................... 190!
WLAN Statistics .................................................................................................................................................................................. 190!
Call Statistics ...................................................................................................................................................................................... 191!
Status Messages .................................................................................................................................................................................. 191!

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
5
WLAN Diagnostics.............................................................................................................................................................................. 192!
Restoring Factory Defaults................................................................................................................................................................. 193!
Phone Webpages................................................................................................................................................................................. 194!
Device Information......................................................................................................................................................................... 194!
Network Setup ................................................................................................................................................................................ 195!
Streaming Statistics ........................................................................................................................................................................ 196!
Device Logs.................................................................................................................................................................................... 197!
Capturing a Screenshot of the Phone Display.................................................................................................................................... 199!
Additional Documentation ................................................................................................................................................................... 200!

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
6
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.
Part Number
Description
Peak Antenna
Gain
Frequency
Ranges
Available
Channels
Channel Set
CP-8821-K9=
Cisco Wireless IP
Phone 8821
2.4 GHz = 2.4 dBi
5 GHz = 3.0 dBi
2.412 - 2.472 GHz
5.180 - 5.240 GHz
5.260 - 5.320 GHz
5.500 - 5.720 GHz
5.745 - 5.825 GHz
13
4
4
12
5
1-13
36,40,44,48
52,56,60,64
100-144
149,153,157,161,165
CP-8821-EX-K9=
Cisco Wireless IP
Phone 8821-EX
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.

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
7
Site Survey
Before deploying the Cisco Wireless IP Phone 8821 and 8821-EX into a production environment, a site survey must be
completed by a Cisco certified partner with the advanced wireless LAN specialization. During the site survey the RF spectrum
can be analyzed to determine which channels are usable in the desired band (5 GHz or 2.4 GHz). Typically there is less
interference in the 5 GHz band as well as more non-overlapping channels, so 5 GHz is the preferred band for operation and
even more highly recommended when the Cisco Wireless IP Phone 8821 and 8821-EX is to be used in a mission critical
environment. The site survey will include heatmaps showing the intended coverage plan for the location. The site survey will
also determine which access point platform type, antenna type, access point configuration (channel and transmit power) to use
at the location. It is recommended to select an access point with integrated antennas for non-rugged environments (e.g. office,
healthcare, education, hospitality) and an access point platform requiring external antennas for rugged environments (e.g.
manufacturing, warehouse, retail).
The wireless LAN must be validated to ensure it meets the requirements to deploy the Cisco Wireless IP Phone 8821 and 8821-
EX.
Signal
The cell edge should be designed to -67 dBm where there is a 20-30% overlap of adjacent access points at that signal
level.
This ensures that the Cisco Wireless IP Phone 8821 and 8821-EX always have adequate signal and can hold a signal
long enough in order to roam seamlessly where signal based triggers are utilized vs. packet loss triggers.
Also need to ensure that the upstream signal from the Cisco Wireless IP Phone 8821 and 8821-EX meets the access
point’s receiver sensitivity for the transmitted data rate. Rule of thumb is to ensure that the received signal at the access
point is -67 dBm or higher.
It is recommended to design the cell size to ensure that the Cisco Wireless IP Phone 8821 and 8821-EX can hold a
signal for at least 5 seconds.
Channel Utilization
Channel Utilization levels should be kept under 40%.
The Cisco Wireless IP Phone 8821 and 8821-EX convert the 0-255 scale value to a percentage, so 105 would equate to
around 40% in the Cisco Wireless IP Phone 8821 and 8821-EX.
Noise
Noise levels should not exceed -92 dBm, which allows for a Signal to Noise Ratio (SNR) of 25 dB where a -67 dBm
signal should be maintained.
Also need to ensure that the upstream signal from the Cisco Wireless IP Phone 8821 and 8821-EX meets the access
point’s signal to noise ratio for the transmitted data rate.
Packet Loss / Delay
Per voice guidelines, packet loss should not exceed 1% packet loss; otherwise voice quality can be degraded
significantly.
Jitter should be kept at a minimal (< 100 ms).
Retries
802.11 retransmissions should be less than 20%.
Multipath
Multipath should be kept to a minimal as this can create nulls and reduce signal levels.

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
8
Call Control
The Cisco Wireless IP Phone 8821 and 8821-EX utilize Session Initiation Protocol (SIP) for call control with the following
applications.
• Cisco Unified Communications Manager (CUCM)
Minimum = 9.1(2)
Recommended = 10.5(2), 11.0(1), 11.5(1)
• Cisco Unified Communications Manager Express (CUCME)
Minimum = 10.5
Recommended = 11.0, 11.5, and later
• Cisco Unified Survivable Remote Site Telephony (SRST)
Minimum = 10.5
Recommended = 11.0, 11.5, and later
Note: Cisco Unified Communications Manager requires a device package to be installed or service release update in order to
enable Cisco Wireless IP Phone 8821 and 8821-EX device support.
Device packages for Cisco Unified Communications Manager are available at the following location.
http://software.cisco.com/download/navigator.html?mdfid=278875240
Prior to release 11.0 of Cisco Unified Communications Manager Express, the Cisco Wireless IP Phone 8821 and 8821-EX are
to utilize the fast track method utilizing the Cisco Unified IP Phone 9971 as the reference model (use 7975 as reference model if
needing softkey template support).With release 11.0 and later of Cisco Unified Communications Manager Express, the Cisco
IP Phone 8821 and 8821-EX can utilize the Cisco IP Phone 8861 as the reference model.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/feature/phone_feature/phone_feature_support_guide.html#_Toc4
36645184
Wireless LAN
The Cisco Wireless IP Phone 8821 and 8821-EX are supported on the following Cisco Wireless LAN solutions.
• Cisco Wireless LAN Controller and Cisco Lightweight Access Points
Minimum = 8.0.121.0
Recommended = 8.0.140.0, 8.2.141.0
• Cisco Meraki Access Points
• Cisco Autonomous Access Points
Minimum = 12.4(21a)JY
Recommended = 12.4(25d)JA2, 15.2(4)JB6, 15.3(3)JD
Note: Cisco Wireless LAN Controller release 8.0.121.0 or later is required if utilizing Flexconnect + Local Switching mode.
Access Points
Below are the Cisco Access Points that are supported.
Any access point model that is not listed below is not supported.

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
9
Note: The Cisco Wireless IP Phone 8821 and 8821-EX are supported with the Cisco AP3600 when the internal 802.11a/b/g/n
radio is utilized, however is not supported if the 802.11ac module (AIR-RM3000AC) for the Cisco AP3600 is installed.
The table below lists the modes that are supported by each Cisco Access Point.
Cisco AP
Series
802.11a
802.11b
802.11g
802.11n
802.11ac
Lightweight
Autonomous
600
Yes
Yes
Yes
Yes
No
Yes
No

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
10
The Cisco Wireless IP Phone 8821 and 8821-EX are currently supported on the Cisco Meraki MR18, MR24, MR26, MR32,
MR34, MR42, MR52, MR53 indoor access point platforms and the Cisco Meraki MR72 outdoor access point platform only.
700
Yes
Yes
Yes
Yes
No
Yes
Yes
700W
Yes
Yes
Yes
Yes
No
Yes
Yes
1040
Yes
Yes
Yes
Yes
No
Yes
Yes
1130
Yes
Yes
Yes
No
No
Yes
Yes
1140
Yes
Yes
Yes
Yes
No
Yes
Yes
1240
Yes
Yes
Yes
No
No
Yes
Yes
1250
Yes
Yes
Yes
Yes
No
Yes
Yes
1260
Yes
Yes
Yes
Yes
No
Yes
Yes
1600
Yes
Yes
Yes
Yes
No
Yes
Yes
1700
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1810
Yes
Yes
Yes
Yes
Yes
Yes
No
1810W
Yes
Yes
Yes
Yes
Yes
Yes
No
1830
Yes
Yes
Yes
Yes
Yes
Yes
No
1850
Yes
Yes
Yes
Yes
Yes
Yes
No
2600
Yes
Yes
Yes
Yes
No
Yes
Yes
2700
Yes
Yes
Yes
Yes
Yes
Yes
Yes
2800
Yes
Yes
Yes
Yes
Yes
Yes
No
3500
Yes
Yes
Yes
Yes
No
Yes
Yes
3600
Yes
Yes
Yes
Yes
Yes (with
AIR-
RM3000AC
module)
Yes
Yes
3700
Yes
Yes
Yes
Yes
Yes
Yes
Yes
3800
Yes
Yes
Yes
Yes
Yes
Yes
No
890
Yes
Yes
Yes
Yes
No
Yes
Yes

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
11
https://meraki.cisco.com/products/wireless#models
The Cisco Meraki MR12, MR16, and Z1 access point platforms are not certified for use with Cisco Wireless IP Phone 8821 and
8821-EX deployments.
Note: If an access point model is not specifically listed above, then it is not supported.
VoWLAN is currently not supported in conjunction with Cisco Aironet 1500 Series outdoor access points.
No support for any access point model operating in MESH mode.
No support for 3rd party access points as there are no interoperability tests performed for 3rd party access points.
However, the user should have basic functionality when connected to a Wi-Fi compliant access point.
Some of the key features are the following:
• 5 GHz (802.11a/n/ac)
• Wi-Fi Protected Access v2 (WPA2+AES)
• Wi-Fi Multimedia (WMM)
• Traffic Specification (TSPEC)
• Traffic Classification (TCLAS)
• Differentiated Services Code Point (DSCP)
• Class of Service (CoS / 802.1p)
• QoS Basic Service Set (QBSS)
Antenna Systems
Some of the Cisco Access Points require or allow external antennas.
Please refer to the following URL for the list of supported antennas and how these external antennas should be mounted.

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
12
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-antennas-
accessories/product_data_sheet09186a008008883b.html
All indoor Cisco Meraki access points have internal antennas and all outdoor Cisco Meraki access points require external
antennas.
https://meraki.cisco.com/products/wireless/antennas-power
3rd party antennas are not supported, as there is no interoperability testing performed against 3rd party antennas including
Distributed Antenna Systems (DAS) and Leaky Coaxial Systems.
Please refer to the following URL for more info on Cisco Wireless LAN over Distributed Antenna Systems.
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1130-ag-series/positioning_statement_c07-565470.html
Note: Cisco Access Points with integrated internal antennas (other than the W series) are to be mounted on the ceiling as they
have omni-directional antennas and are not designed to be wall mounted.
Protocols
Supported voice and wireless LAN protocols include the following:
• 802.11a,b,d,e,g,h,i,n,r,ac
• Wi-Fi MultiMedia (WMM)
• Traffic Specification (TSPEC)
• Traffic Classification (TCLAS)
• Simple Certificate Enrollment Protocol (SCEP)
• Session Initiation Protocol (SIP)
• Real Time Protocol (RTP)
• G.722, G.711, iSAC, iLBC, G.729
• Cisco Discovery Protocol (CDP)
Wi-Fi
The following table lists the data rates, ranges, and receiver sensitivity info for Cisco Wireless IP Phone 8821 and 8821-EX.
5 GHz Specifications
5 GHz - 802.11a
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 14 dBm
(Depends on region)
6 Mbps
OFDM - BPSK
-94 dBm
9 Mbps
OFDM - BPSK
-93 dBm
12 Mbps
OFDM - QPSK
-92 dBm
18 Mbps
OFDM - QPSK
-89 dBm
24 Mbps
OFDM - 16 QAM
-86 dBm

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
13
36 Mbps
OFDM - 16 QAM
-83 dBm
48 Mbps
OFDM - 64 QAM
-78 dBm
54 Mbps
OFDM - 64 QAM
-76 dBm
5 GHz - 802.11n (HT20)
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 13 dBm
(Depends on region)
7 Mbps (MCS 0)
OFDM - BPSK
-94 dBm
14 Mbps (MCS 1)
OFDM - QPSK
-91 dBm
21 Mbps (MCS 2)
OFDM - QPSK
-89 dBm
29 Mbps (MCS 3)
OFDM - 16 QAM
-86 dBm
43 Mbps (MCS 4)
OFDM - 16 QAM
-82 dBm
58 Mbps (MCS 5)
OFDM - 64 QAM
-77 dBm
65 Mbps (MCS 6)
OFDM - 64 QAM
-76 dBm
72 Mbps (MCS 7)
OFDM - 64 QAM
-74 dBm
5 GHz - 802.11n (HT40)
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 13 dBm
(Depends on region)
15 Mbps (MCS 0)
OFDM - BPSK
-91 dBm
30 Mbps (MCS 1)
OFDM - QPSK
-88 dBm
45 Mbps (MCS 2)
OFDM - QPSK
-86 dBm
60 Mbps (MCS 3)
OFDM - 16 QAM
-83 dBm
90 Mbps (MCS 4)
OFDM - 16 QAM
-79 dBm
120 Mbps (MCS 5)
OFDM - 64 QAM
-75 dBm
135 Mbps (MCS 6)
OFDM - 64 QAM
-73 dBm
150 Mbps (MCS 7)
OFDM - 64 QAM
-72 dBm
5 GHz - 802.11ac (VHT20)
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 12 dBm
(Depends on region)
7 Mbps (MCS 0)
OFDM - BPSK
-93 dBm
14 Mbps (MCS 1)
OFDM - QPSK
-90 dBm
21 Mbps (MCS 2)
OFDM - QPSK
-87 dBm
29 Mbps (MCS 3)
OFDM - 16 QAM
-84 dBm
43 Mbps (MCS 4)
OFDM - 16 QAM
-81 dBm
58 Mbps (MCS 5)
OFDM - 64 QAM
-76 dBm
65 Mbps (MCS 6)
OFDM - 64 QAM
-75 dBm
72 Mbps (MCS 7)
OFDM - 64 QAM
-74 dBm
87 Mbps (MCS 8)
OFDM – 256 QAM
-70 dBm
5 GHz - 802.11ac (VHT40)
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 12 dBm
(Depends on region)
15 Mbps (MCS 0)
OFDM - BPSK
-90 dBm
30 Mbps (MCS 1)
OFDM - QPSK
-87 dBm
45 Mbps (MCS 2)
OFDM - QPSK
-85 dBm
60 Mbps (MCS 3)
OFDM - 16 QAM
-82 dBm
90 Mbps (MCS 4)
OFDM - 16 QAM
-79 dBm
120 Mbps (MCS 5)
OFDM - 64 QAM
-73 dBm
135 Mbps (MCS 6)
OFDM - 64 QAM
-72 dBm
150 Mbps (MCS 7)
OFDM - 64 QAM
-72dBm

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
14
2.4 GHz Specifications
2.4 GHz - 802.11b
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 17 dBm
(Depends on region)
1 Mbps
DSSS - BPSK
-98 dBm
2 Mbps
DSSS - QPSK
-96 dBm
5.5 Mbps
DSSS - CCK
-93 dBm
11 Mbps
DSSS - CCK
-91 dBm
2.4 GHz - 802.11g
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 14 dBm
(Depends on region)
6 Mbps
OFDM - BPSK
-95 dBm
9 Mbps
OFDM - BPSK
-94 dBm
12 Mbps
OFDM - QPSK
-93 dBm
18 Mbps
OFDM - QPSK
-90 dBm
24 Mbps
OFDM - 16 QAM
-87 dBm
36 Mbps
OFDM - 16 QAM
-84 dBm
48 Mbps
OFDM - 64 QAM
-79 dBm
54 Mbps
OFDM - 64 QAM
-77 dBm
2.4 GHz - 802.11n (HT20)
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 13 dBm
(Depends on region)
7 Mbps (MCS 0)
OFDM - BPSK
-95 dBm
14 Mbps (MCS 1)
OFDM - QPSK
-92 dBm
21 Mbps (MCS 2)
OFDM - QPSK
-90 dBm
29 Mbps (MCS 3)
OFDM - 16 QAM
-87 dBm
43 Mbps (MCS 4)
OFDM - 16 QAM
-83 dBm
58 Mbps (MCS 5)
OFDM - 64 QAM
-78 dBm
65 Mbps (MCS 6)
OFDM - 64 QAM
-77 dBm
72 Mbps (MCS 7)
OFDM - 64 QAM
-75 dBm
180 Mbps (MCS 8)
OFDM – 256 QAM
-67 dBm
200 Mbps (MCS 9)
OFDM – 256 QAM
-66 dBm
5 GHz - 802.11ac (VHT80)
Data Rate
Modulation
Receiver Sensitivity
Max Tx Power = 12 dBm
(Depends on region)
33 Mbps (MCS 0)
OFDM - BPSK
-87 dBm
65 Mbps (MCS 1)
OFDM - QPSK
-83 dBm
98 Mbps (MCS 2)
OFDM - QPSK
-81 dBm
130 Mbps (MCS 3)
OFDM - 16 QAM
-78 dBm
195 Mbps (MCS 4)
OFDM - 16 QAM
-75 dBm
260 Mbps (MCS 5)
OFDM - 64 QAM
-73 dBm
293 Mbps (MCS 6)
OFDM - 64 QAM
-68 dBm
325 Mbps (MCS 7)
OFDM - 64 QAM
-68 dBm
390 Mbps (MCS 8)
OFDM – 256 QAM
-64 dBm
433 Mbps (MCS 9)
OFDM – 256 QAM
-62 dBm

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
15
Note: Receiver sensitivity is the minimum signal needed to decode a packet at a certain data rate.
The above values are pure radio specifications and do not account for the gain of the single integrated antenna.
To achieve 802.11n/ac connectivity, it is recommended that the Cisco Wireless IP Phone 8821 and 8821-EX be within 100 feet
of the access point.
Regulatory
World Mode (802.11d) allows a client to be used in different regions, where the client can adapt to using the channels and
transmit powers advertised by the access point in the local environment.
The Cisco Wireless IP Phone 8821 and 8821-EX operate best when the access point is 802.11d enabled, where it can determine
which channels and transmit powers to use per the local region.
Enable World Mode (802.11d) for the corresponding country where the access point is located.
Some 5 GHz channels are also used by radar technology, which requires that the 802.11 client and access point be 802.11h
compliant if utilizing those radar frequencies (DFS channels). 802.11h requires 802.11d to be enabled.
The Cisco Wireless IP Phone 8821 and 8821-EX will passively scan DFS channels first before engaging in active scans of those
channels.
If 802.11d is not enabled, then the Cisco Wireless IP Phone 8821 and 8821-EX can attempt to connect to the access point using
reduced transmit power.
Below are the countries and their 802.11d codes that are supported by the Cisco Wireless IP Phone 8821 and 8821-EX.
Argentina (AR)
Iceland (IS)
Philippines (PH)
Australia (AU)
India (IN)
Poland (PL)
Austria (AT)
Ireland (IE)
Portugal (PT)
Bahrain (BH)
Israel (IL)
Puerto Rico (PR)
Belgium (BE)
Italy (IT)
Romania (RO)
Brazil (BR)
Japan (JP)
Russian Federation (RU)
Bulgaria (BG)
Korea (KR)
Saudi Arabia (SA)
Canada (CA)
Latvia (LV)
Serbia (RS)
Chile (CL)
Liechtenstein (LI)
Singapore (SG)
Colombia (CO)
Lithuania (LT)
Slovakia (SK)
Costa Rica (CR)
Luxembourg (LU)
Slovenia (SI)
Croatia (HR)
Macau (MO)
South Africa (ZA)
Cyprus (CY)
Macedonia (MK)
Spain (ES)
Czech Republic (CZ)
Malaysia (MY)
Sweden (SE)
Denmark (DK)
Malta (MT)
Switzerland (CH)
Dominican Republic (DO)
Mexico (MX)
Taiwan (TW)
Ecuador (EC)
Monaco (MC)
Thailand (TH)
Egypt (EG)
Montenegro (ME)
Turkey (TR)
Estonia (EE)
Netherlands (NL)
Ukraine (UA)
Finland (FI)
New Zealand (NZ)
United Arab Emirates (AE)
France (FR)
Nigeria (NG)
United Kingdom (GB)
Germany (DE)
Norway (NO)
United States (US)
Gibraltar (GI)
Oman (OM)
Uruguay (UY)
Greece (GR)
Panama (PA)
Venezuela (VE)
Hong Kong (HK)
Paraguay (PY)
Vietnam (VN)

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
16
Hungary (HU)
Peru (PE)
Note: Compliance information is available on the Cisco Product Approval Status web site at the following URL:
http://tools.cisco.com/cse/prdapp/jsp/externalsearch.do?action=externalsearch&page=EXTERNAL_SEARCH
Bluetooth
The Cisco Wireless IP Phone 8821 and 8821-EX support Bluetooth 3.0 technology allowing for wireless headset communications.
Bluetooth enables low bandwidth wireless connections within a range of 30 feet, however it is recommended to keep the
Bluetooth device within 10 feet of the Cisco Wireless IP Phone 8821 and 8821-EX.
Up to ten headsets can be paired, where the previously connected headset is given priority.
The Bluetooth device does not need to be within direct line-of-sight of the phone, but barriers, such as walls, doors, etc. can
potentially impact the quality.
Bluetooth utilizes the 2.4 GHz frequency just like 802.11b/g/n and many other devices (e.g. microwave ovens, cordless phones,
etc.), so the Bluetooth quality can potentially be interfered with due to using this unlicensed frequency.
Bluetooth Profiles
The Cisco Wireless IP Phone 8821 and 8821-EX support the following Bluetooth profiles.
Hands-Free Profile (HFP)
With Bluetooth Hands-Free Profile (HFP) support, the following features can be available if supported by the Bluetooth
headset.
• Ring
• Answer a call
• End a call
• Volume Control
• Last Number Redial
• Call Waiting
• Divert / Reject
• 3 way calling (Hold & Accept and Release & Accept)
• Speed Dialing
Phone Book Access Profile (PBAP)
Phone Book Access Profile (PBAP) support enables the exchange of phone book objects between devices.
For more information, refer to the documentation from the Bluetooth headset manufacturer.
Coexistence (802.11b/g/n + Bluetooth)
If using Coexistence where 802.11b/g/n and Bluetooth are used simultaneously, then there are some limitations and deployment
requirements to be considered as they both utilize the 2.4 GHz frequency range.
Capacity

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
17
When using Coexistence (802.11b/g/n + Bluetooth), call capacity is reduced due to the utilization of CTS to protect the
802.11g/n and Bluetooth transmissions.
Multicast Audio
Multicast audio from Push To Talk (PTT), Music on Hold (MMOH) and other applications are not supported when
using Coexistence.
Voice Quality
Depending on the current data rate configuration, CTS may be sent to protect the Bluetooth transmissions when using
Coexistence.
In some environments, 6 Mbps may need to be enabled.
Note: It is recommended to use 802.11a/n/ac if using Bluetooth due to 802.11b/g/n and Bluetooth both utilizing 2.4 GHz, but
also due to the above limitations.
Languages
The Cisco Wireless IP Phone 8821 and 8821-EX currently support the following languages.
The corresponding locale package must be installed to enable support for that language. English is the default language on the
phone.
Download the locale packages from the Localization page at the following URL:
http://software.cisco.com/download/navigator.html?mdfid=278875240
8821-EX Certifications
The Cisco Wireless IP Phone 8821-EX is certified for Canadian Standards Association (CSA) Class I Division 2 and
Atmospheres Explosibles (ATEX) Class I Zone 2.
Arabic
French
Polish
Bulgarian
German
Portuguese
Catalan
Greek
Romanian
Chinese
Hebrew
Russian
Croatian
Hungarian
Serbian
Czech
Italian
Slovak
Danish
Japanese
Slovenian
Dutch
Korean
Spanish
English
Latvian
Swedish
Estonian
Lithuanian
Thai
Finnish
Norwegian
Turkish

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
18
Certification ensures that the equipment is fit for its intended purpose and that adequate information is supplied with it to ensure
that it can be used safely.
Canadian Standards Association (CSA) Class I Division 2
Laws and regulations in most municipalities, states, and provinces in North America require certain products to be tested to a
specific standard or group of standards when they are to be classified safe when used in an explosive environment.
In North America, hazardous locations have traditionally been defined by the following combination of Class and Division:
• Class I - A location where a quantity of flammable gas or vapor, sufficient to produce an explosive or ignitable
mixture, may be present in the air.
• Class II - A location made hazardous by the presence of combustible elements.
• Class III - A location made hazardous by the presence of easily ignitable fibers in the air.
• Division 1 - A location where a classified hazard is likely to exist.
• Division 2 - A location where a classified hazard does not normally exist but is possible under abnormal conditions.
More recently in North America, for Class I hazards, locations can be classified under the zone system as defined by the
IEC/ATEX mentioned below.
Atmospheres Explosibles (ATEX) Class I Zone 2
Equipment and protective systems intended for use in potentially explosive atmospheres must comply with ATEX Directive
94/9/EC.
Areas classified into zones must be protected from effective sources of ignition.
Locations where explosive gas atmospheres are likely to be present are divided into IEC/EU-defined Zones (Class I Zone 0, 1, 2
for locations with flammable gases or vapors and Class II Zone 20, 21, 22 for locations with combustible dust or ignitable
fibers).
Class I
• Zone 0 - An area in which an explosive gas atmosphere is continuously present or present for long periods.
• Zone 1 - An area in which an explosive gas atmosphere is likely to occur in normal operation.
• Zone 2- An area in which an explosive gas atmosphere does not normally exist, or if they do occur, will exist only for
a short period of time.
Class II
• Zone 20 – An area in which an ignitable concentrations of combustible dust or ignitable fibers/flyings are present
continuously or for long periods of time under normal operating conditions.
• Zone 21 - An area in which an ignitable concentrations of combustible dust or ignitable fibers/flyings are likely to exist
under normal operating conditions.
• Zone 22 - An area in which an ignitable concentrations of combustible dust or ignitable fibers/flyings are not likely to
exist under normal operating conditions.
Battery Life
The Cisco Wireless IP Phone 8821 and 8821-EX have a 2060 mAh smart battery.
The Cisco Wireless IP Phone 8821 and 8821-EX battery’s capacity will be reduced to 80% after 500 full charging cycles
(charging from empty to full).
Expected battery life time depends on

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
19
There are many factors that can influence actual battery life time.
Usage
Battery life will be reduced when the Cisco Wireless IP Phone 8821 or 8821-EX user is on call, using Bluetooth, using
applications, receiving XSI messages, or navigating the menus on the phone.
Coverage
Ensure the Cisco Wireless IP Phone 8821 and 8821-EX remain in a good RF coverage area and is able to maintain a constant
connection to the Cisco Unified Communications Manager.
If the Cisco Wireless IP Phone 8821 or 8821-EX user travels out of range and remains out of range for a significant duration,
battery life can be reduced.
Scan Mode
The Cisco Wireless IP Phone 8821 and 8821-EX supports 3 different scan modes (Continuous, Auto, Single AP), where
Continuous is the default configuration.
The configured scan mode will determine the battery life baseline.
• Continuous scan mode is designed for Cisco Wireless IP Phone 8821 and 8821-EX users that are constantly on the
move where frequent roaming events occur and to maximize performance and connectivity, but power consumption is
higher.
• Auto scan mode is designed for Cisco Wireless IP Phone 8821 and 8821-EX users that roam occasionally and require
more idle battery life than Continuous scan mode can offer.
• Single AP scan mode is designed for Cisco Wireless IP Phone 8821 and 8821-EX users that do not roam and require
maximum idle battery life.
Proxy ARP
For optimal idle battery life, it is recommended to utilize an access point that supports the Cisco Compatible Extensions (CCX)
Proxy ARP feature. CCX Proxy ARP allows the Cisco Wireless IP Phone 8821 and 8821-EX to remain in suspend mode
longer versus having to wake up at each DTIM period, therefore reducing 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 non-configurable. For Cisco Autonomous
Access Points, CCX Proxy ARP is disabled by default, but can be enabled via the dot11 arp-cache optional command.
If the access point does not support CCX Proxy ARP, then the Cisco Wireless IP Phone 8821 and 8821-EX must wake up at
each DTIM period, which can reduce idle battery life as much as 50%.
Transmit Power
Call State
Scan Mode
Expected
Battery Time
On Call
Continuous
Up to 13 hours
Auto
Up to 13 hours
Idle
Continuous
Up to 48 hours
Auto
Up to 96 hours

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
20
It is recommended to utilize an access point that supports the Cisco Compatible Extensions (CCX) Dynamic Transmit Power
Control (DTPC) feature. When DTPC is enabled, the access point will advertise its transmit power to all clients, where the
Cisco Wireless IP Phone 8821 and 8821-EX can then adjust its transmit power to a minimum level that is only necessary to
communicate with the connected access point, therefore also reducing unnecessary noise in other areas.
Multicast
If the Cisco Wireless IP Phone 8821 or 8821-EX subscribes to a multicast stream, then the Cisco Wireless IP Phone 8821 or
8821-EX must wake up at each DTIM period to receive the multicast frames, therefore power consumption is increased.
Power Save Protocol
The access point must support U-APSD, which is the power save protocol that will be utilized when on call and when in idle.
On Call Power Save in the Wi-Fi Profile should remain Enabled so the Cisco Wireless IP Phone 8821 and 8821-EX can
utilize U-APSD.
If On Call Power Save is Disabled, then the Cisco Wireless IP Phone 8821 and 8821-EX will utilize active mode when on call,
but still use U-APSD when in idle.
Only disable On Call Power Save for troubleshooting purposes.
Phone Care
The Cisco Wireless IP Phone 8821 and 8821-EX are designed to provide protection from dust, liquid splashes, and moisture.
For standard cleaning, can use a soft, moist cloth to wipe the phone. For thorough cleaning, we recommend using Caviwipes™
or Saniwipes™.
Caviwipes and Saniwipes contain up to 17% isopropanol. Any cleaning solution containing a higher amount of isopropanol,
including pure isopropanol, or an alternative alcohol-based liquid could potentially damage the phone.
Do not use bleach or other caustic products to clean the phone.
Do not use compressed air to clean the opening of the phone as it can damage the phone and voids the phone warranty.
Carry cases can additionally help protect the phone further and provide drop protection.
For more information, refer to the Cisco Wireless IP Phone 8821 and 8821-EX User Guide at this URL:
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8821/english/accessories/w88x_b_wireless-ip-phone-882x-
accessory.html
Accessories
The following accessories are available for the Cisco Wireless IP Phone 8821 and 8821-EX.
• Batteries
• Phone Power Supply
• Holster Case
• Leather Case
• Lanyard
• Desktop Charger