What Networking Protocols Are Used - Cisco 7970G Administration Manual

Chapter 1 An Overview of the Cisco Unified IP Phone

What Networking Protocols Are Used?

Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol
Bootstrap Protocol
(BootP)
Cisco Discovery
Protocol (CDP)
Dynamic Host
Configuration Protocol
(DHCP)
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
Cisco Unified IP Phones support several industry-standard and Cisco networking
protocols required for voice communication.
the networking protocols that the Cisco Unified IP Phones 7970G/7971G-GE
supports.
Purpose
BootP enables a network device such
as the Cisco Unified IP Phone to
discover certain startup information,
such as its IP address.
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.
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 to configure additional
network parameters.
What Networking Protocols Are Used?
Table 1-1 provides an overview of
Usage Notes
If you are using BootP to assign IP
addresses to the Cisco
Unified IP Phone, the BOOTP
Server option shows "Yes" in the
network configuration settings on the
phone.
The Cisco Unified 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.
DHCP is enabled by default. If
disabled, you must manually
configure the IP address, subnet
mask, gateway, and a 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
Unified CallManager System Guide.
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