Cisco 7975G Software Manual page 29

Cisco Unified IP Phone
Network protocol
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Real-Time Control
Protocol (RTCP)
Real-Time Transport
Protocol (RTP)
Session Initiation Protocol
(SIP)
Purpose
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
transport of real-time data, such as
interactive voice and video, over data
networks.
SIP is the Internet Engineering Task
Force (IETF) standard for multimedia
conferencing over IP. SIP is an
ASCII-based application-layer control
protocol (defined in RFC 3261) that
can establish, maintain, and terminate
calls between two or more endpoints.
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Network Protocols
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
RTCP is disabled by default, but you can
enable it on a per-phone basis in Cisco
Unified Communications Manager
Administration. For more information,
see Network Configuration Menu, on
page 103.
Cisco Unified IP Phones use the RTP
protocol to send and receive real-time
voice traffic from other phones and
gateways.
Like other VoIP protocols, SIP addresses
the functions of signaling and session
management within a packet telephony
network. Signaling allows call
information to be carried across network
boundaries. Session management
provides the ability to control the
attributes of an end-to-end call.
You can configure the Cisco Unified IP
Phone to use either SIP or Skinny Client
Control Protocol (SCCP).
Cisco Unified IP Phones do not support
the SIP protocol when the phones
operate in IPv6 address mode.
Communications Manager 9.0 (SCCP and SIP)
9