Specifications

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Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0
OL-10802-02
Chapter 2 An Overview of the Voice Over IP Wireless Network
Components of the VoIP Wireless Network
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.
Cisco Unified IP Phones use 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.
Extensible
Authentication Protocol
(EAP)
Password-based mutual
authentication scheme between the
client (phone) and a RADIUS server.
Cisco Unified Wireless
IP
Phone 7921G can use EAP for
authentication with the wireless
network.
Extensible
Authentication
Protocol-Flexible
Authentication via
Secure Tunneling
(EAP-FAST)
Protected Access Credential (PAC)
authentication scheme between the
client (phone) and an EAP-FAST
RADIUS server.
Cisco Unified Wireless
IP
Phone 7921G can use EAP-FAST
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
Unified
CallManager System Guide.
Table 2-3 Supported Networking Protocols on the Cisco Unified Wireless IP Phone 7921G
Networking Protocol Purpose Usage Notes