What Networking Protocols Are Used - Cisco 7912G - IP Phone VoIP Administration Manual

Chapter 1 An Overview of the Cisco IP Phone

What Networking Protocols Are Used?

Table 1-1 Supported Networking Protocols on the Cisco IP Phone
Networking Protocol
Cisco Discovery
Protocol (CDP)
Dynamic Host
Configuration Protocol
(DHCP)
Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G
OL-6313-01
Cisco IP Phones support several industry-standard and Cisco networking
protocols for voice communication.
networking protocols that the Cisco IP Phone models 7902G/7905G/7912G
supports.
Purpose
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 configure additional network
parameters.
What Networking Protocols Are Used?
Table 1-1 provides an overview of the
Usage Notes
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.
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,
see Cisco CallManager System
Guide.
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