Chapter 2 An Overview of the Wireless Network
Components of the VoIP Wireless Network
2-6
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
Networking Protocols Used with Cisco Wireless IP Phones
Cisco IP Phones support several industry-standard and Cisco networking
protocols for voice communication.
Table 2-1
provides an overview of the
networking protocols that the Cisco Wireless IP Phone 7920 supports.
Table 2-1
Supported Networking Protocols on the Cisco Wireless IP Phone 7920
Networking Protocol
Purpose
Usage Notes
Cisco Centralized Key
Management (CCKM)
Key generation protocol used for fast
authentication in wireless networks.
Cisco Wireless IP Phone 7920 uses
CCKM for fast, secure roaming
between access points.
Cisco Discovery
Protocol (CDP)
Device-discovery protocol that runs
on all Cisco-manufactured
equipment.
Using CDP, a device can advertise its
existence to other devices and receive
information about other devices in
the network.
The Cisco IP Phone uses CDP to
communicate information such as
auxiliary VLAN ID, per-port power
management details, and Quality of
Service (QoS) configuration
information with the Cisco Catalyst
switch.
Cisco Light Extensible
Authentication Protocol
(LEAP)
Proprietary password-based mutual
authentication scheme between the
client (phone) and a RADIUS server.
Cisco Wireless IP Phone 7920 uses
LEAP for authentication with the
wireless network.
Dynamic Host
Configuration Protocol
(DHCP)
Dynamically allocates and assigns an
IP address to network devices.
DHCP enables an IP phone to
connect to the network and become
operational without the administrator
assigning an IP address or
configuring additional network
parameters.
DHCP is enabled by default. If
disabled, you must manually
configure the IP address, subnet
mask, gateway, and an TFTP server
on each phone locally.
Use DHCP custom option 150. With
this method, you configure the TFTP
server IP address as the option value.
For additional supported DHCP
configurations, refer to
Cisco CallManager System Guide
.
Summary of Contents for 7920 - Unified Wireless IP Phone VoIP
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