Cisco 7912G - Manual (Page 33)

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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SIP), Cisco Unified IP Phones
OL-8131-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
What Networking Protocols Are Used?
Cisco Unified IP Phones support several industry-standard and Cisco networking
protocols for voice communication.
Table 1-1 provides an overview of the
networking protocols that the Cisco Unified IP Phone 7905G and 7912G support.
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol Purpose Usage Notes
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 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.
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
Unified CallManager System Guide.
HyperText Transfer
Protocol (HTTP) HTTP is the standard way of
transferring information and moving
documents across the Internet and the
World Wide Web. The Cisco Unified IP Phones use
HTTP for the XML services and for
troubleshooting purposes.