1-8
Cisco Unified IP Video Phone 7985G Administration Guide
OL-8726-02
Chapter 1 An Overview of the Cisco Unified IP Video Phone
What Networking Protocols Are Used?
Table 1-1
Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol
Purpose
Usage Notes
Cisco Discovery
Protocol (CDP)
CDP, a device-discovery protocol,
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
your needing to manually assign an
IP address or to configure additional
network parameters.
The system enables DHCP by
default. If DHCP is 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
.
Internet Protocol (IP)
IP messaging protocol addresses and
sends packets across the network.
To communicate by using IP, ensure
network devices have an assigned IP
address, subnet, and gateway.
IP addresses, subnets, and gateways
identifications automatically get
assigned if you are using the Cisco
Unified IP Phone with Dynamic Host
Configuration Protocol (DHCP). If
you are not using DHCP, you must
manually assign these properties to
each phone locally.
Real-Time Transport
Protocol (RTP)
RTP serves as a standard protocol for
transporting real-time data, such as
interactive voice and video, over data
networks.
Cisco Unified IP Phones use the RTP
protocol to send and receive
real-time voice traffic from other
phones and gateways.