Cisco 7971G-GE - IP Phone VoIP Administration Manual page 19

Chapter 1 An Overview of the Cisco Unified IP Phone
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Internet Protocol (IP)
Link Layer Discovery
Protocol (LLDP)
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Real-Time Control Protocol
(RTCP)
Real-Time Transport Protocol
(RTP)
OL-15299-01
Purpose
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.
LLDP-MED is an extension of the LLDP
standard developed for voice products.
RTCP works with Real-Time Transport
Protocol (RTP) to provide QoS data (such as
jitter, latency, and round trip delay) on RTP
streams.
RTP is a standard protocol for transporting
real-time data, such as interactive voice and
video, over data networks.
Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
What Networking Protocols Are Used?
Usage Notes
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.
The Cisco Unified IP Phone supports LLDP
on the PC port.
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
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.
Cisco Unified IP Phones use the RTP protocol
to send and receive real-time voice traffic
from other phones and gateways.
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