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Chapter 1 An Overview of the Cisco Wireless IP Phone 7920
Networking Protocols Used with Cisco Wireless IP Phones
1-8
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
Table 1-1 Supported Networking Protocols on the Cisco Wireless IP Phone
Networking Protocol Purpose Usage Notes
Wi-Fi (802.11b) 802.11 is an open standard that
defines wireless methods of
transmitting Ethernet traffic and is
commonly called Wi-Fi. This
standard defines for radio
frequencies (RF) and data speed for
wireless LAN communications.
Cisco Wireless IP Phone 7920 uses
the 802.11b standard with a range of
2.4-2.497 GHz RF and dynamic rate
scaling of 1, 2, 5.5, and 11Mbps
speeds.
Cisco Discovery
Protocol (CDP)
CDP is a 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.
Dynamic Host
Configuration Protocol
(DHCP)
DHCP dynamically allocates and
assigns an IP address to network
devices.
DHCP enables you to connect an
IP phone into the network and have
the phone become operational
without you needing to manually
assign an IP address or configure
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.
Cisco recommends that you use
DHCP custom option 150. With this
method, you configure the TFTP
server IP address as the option value.
For additional supported DCHP
configurations, refer to
Cisco CallManager System Guide.