Cisco 7800 Series Administration Manual page 22

Supported Network Protocols
Network Protocol
Cisco Discovery Protocol
(CDP)
Dynamic Host
Configuration Protocol
(DHCP)
Hypertext Transfer
Protocol (HTTP)
Hypertext Transfer
Protocol Secure (HTTPS)
Internet Protocol (IP)
Link Layer Discovery
Protocol (LLDP)
Cisco IP Phone 7800 Series for Third-Party Call Control Administration Guide
8
Purpose
CDP is a device-discovery protocol that
runs on all Cisco-manufactured
equipment.
A device can use CDP to 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 the
need to manually assign an IP address or
to configure additional network
parameters.
HTTP is the standard protocol for transfer
of information and movement of
documents across the Internet and the
web.
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.
IP is a messaging protocol that addresses
and sends packets across the network.
LLDP is a standardized network
discovery protocol (similar to CDP) that
is supported on some Cisco and
third-party devices.
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 on each phone
locally.
We recommend that you use DHCP
custom option 160, 159.
Cisco IP Phones use HTTP for XML
services, provisioning, upgrade and
for troubleshooting purposes.
Web applications with both HTTP
and HTTPS support have two URLs
configured. Cisco IP Phones that
support HTTPS choose the HTTPS
URL.
A lock icon is displayed to the user
if the connection to the service is via
HTTPS.
To communicate with IP, network
devices must have an assigned IP
address, subnet, and gateway.
IP addresses, subnets, and gateways
identifications are automatically
assigned if you are using the Cisco
IP Phone with Dynamic Host
Configuration Protocol (DHCP). If
you are not using DHCP, you must
manually assign these properties to
each phone locally.
The Cisco IP Phone supports LLDP
on the PC port.