Cisco 7920 - Unified Wireless IP Phone VoIP, Руководство администратора

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Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
Chapter 2 An Overview of the Wireless Network
Components of the VoIP Wireless Network
Through stronger encryption algorithms, stronger authentication, and rapid key
updates, WPA has significantly improved security compared to WEP. Wireless
clients, such as wireless IP phones, can authenticate at either the access point or
with the network by using a centralized remote authentication dial-in user service
(RADIUS) server.
The Cisco Wireless IP telephony solution provides the following additional
security areas:
•
Wireless network security that prevents unauthorized logins and
compromised communications by using encryption and authentication with
Wired Equivalent Privacy (WEP), Wireless Protected Access (WPA) and
Cisco Light Extensible Authentication Protocol (LEAP)
•
Password protection for directories and databases that includes a Cisco
Wireless IP Phone 7920 phone lock password.
Related Topics
• Networking Protocols Used with Cisco Wireless IP Phones, page 2-6
•
Security Mechanisms in the Wireless Network, page 2-13
Components of the VoIP Wireless Network
The Cisco Wireless IP Phone 7920 must interact with several network
components in the wireless local area network (WLAN) to successfully place and
receive calls.
The following topics provide an overview of the network components:
•
Networking Protocols Used with Cisco Wireless IP Phones, page 2-6
•
Interacting with the Cisco Aironet Access Point, page 2-8
•
Roaming in a Wireless Network, page 2-10
•
Voice Quality in a Wireless Network, page 2-12
• Security Mechanisms in the Wireless Network, page 2-13
•
Interacting with Cisco CallManager, page 2-17
•
Interacting with the DHCP Server, page 2-18