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Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
OL-15299-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
Internet Protocol (IP) IP is a messaging protocol that addresses and
sends packets across the network.
To communicate using 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 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.
Link Layer Discovery
Protocol (LLDP)
LLDP is a standardized network discovery
protocol (similar to CDP) that is supported on
some Cisco and third-party devices.
The Cisco Unified IP Phone supports LLDP
on the PC port.
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
LLDP-MED is an extension of the LLDP
standard developed for voice products.
The Cisco Unified IP Phone supports
LLDP-MED on the SW port to communicate
information such as:
• Voice VLAN configuration
• Device discovery
• Power management
• Inventory management
For more information about LLDP-MED
support, see the LLDP-MED and Cisco
Discovery Protocol white paper:
http://www.cisco.com/en/US/tech/tk652/tk70
1/technologies_white_paper0900aecd804cd4
6d.shtml
Real-Time Control Protocol
(RTCP)
RTCP works with Real-Time Transport
Protocol (RTP) to provide QoS data (such as
jitter, latency, and round trip delay) on RTP
streams.
RTCP is disabled by default, but you can
enable it on a per-phone basis using Cisco
Unified Communications Manager. For more
information, see the “Network Configuration”
section on page 4-25.
Real-Time Transport Protocol
(RTP)
RTP is 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.
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol Purpose Usage Notes