Cisco Unified IP Phone 8941 Administration Manual page 26

Network Protocols
Network protocol
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Real-Time Transport
Protocol (RTP)
Real-Time Control
Protocol (RTCP)
Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 10.0
(SCCP and SIP)
12
Purpose
LLDP-MED is an extension of the LLDP
standard developed for voice products.
RTP is a standard protocol for transporting
real-time data, such as interactive voice and
video, over data networks.
RTCP works in conjunction with RTP to provide
QoS data (such as jitter, latency, and round trip
delay) on RTP streams.
Usage notes
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/tk701/
technologies_white_
paper0900aecd804cd46d.shtml
Cisco Unified IP Phones use
the RTP protocol to send and
receive real-time voice traffic
from other phones and
gateways.
RTCP is disabled by default,
but you can enable it on a per
phone basis by using Cisco
Unified Communications
Manager.