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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.1
OL-14587-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
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/tk
652/tk701/technologies_white_pape
r0900aecd804cd46d.shtml
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.
Real-Time Transport
Protocol (RTP)
RTCP works in conjunction with
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 Menu” section on
page 4-7.
Skinny Client Control
Protocol (SCCP)
SCCP includes a messaging set that
allows communications between call
control servers and endpoint clients
such as IP Phones. SCCP is
proprietary to Cisco Systems.
Cisco Unified IP Phones use SCCP
for call control.
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol Purpose Usage Notes
27


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