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