Specifications

1-6
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5
OL-23092-01
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 required for
voice communication. Table 1-2 provides an overview of the networking protocols that the
Cisco Unified IP Phones 7975G, 7971G-GE, 7970G, 7965G, and 7945G support.
Table 1-2 Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol Purpose Usage Notes
Bootstrap Protocol (BootP) BootP enables a network device such as the
Cisco Unified IP Phone to discover certain
startup information, such as its IP address.
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.
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.
Cisco Peer-to-Peer
Distribution Protocol
(CPPDP)
CPPDP is a Cisco proprietary protocol used to
form a-peer-to-peer hierarchy of devices.
CPPDP is also used to copy firmware or other
files from peer devices to neighboring
devices.
CPPDP is used by the Peer Firmware Sharing
feature.
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 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 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 DHCP
configurations, refer to Dynamic Host
Configuration Protocol and Cisco TFTP in
the Cisco Unified Communications Manager
System Guide.
Hypertext Transfer Protocol
(HTTP)
HTTP is the standard way of transferring
information and moving documents across the
Internet and the web.
Cisco Unified IP Phones use HTTP for the
XML services and for troubleshooting
purposes.
Cisco Unified IP Phones do not support the
use of IPv6 addresses in the URL. You cannot
use a literal IPv6 address in the URL or a
hostname that maps to an IPv6 address.
Hypertext Transfer Protocol
Secure (HTTPS)
Hypertext Transfer Protocol Secure (HTTPS)
is a combination of the Hypertext Transfer
Protocol with the SSL/TLS protocol to
provide encryption and secure identification
of servers.
Web applications with both HTTP and
HTTPS support have two URLs configured.
Cisco Unified IP Phone that support HTTPS
choose the HTTPS URL out of the two URLs.