Cisco 3905 Administration Manual page 23

Cisco Unified IP Phone
Networking Protocol
Link Layer Discovery
Protocol-Media
Endpoint Devices
(LLDP-MED)
Real-Time Transport
Protocol (RTP)
Real-Time Control
Protocol (RTCP)
Session Initiation
Protocol (SIP)
Transmission Control
Protocol (TCP)
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.
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 be
used to establish, maintain, and
terminate calls between two or more
endpoints.
TCP is a connection-oriented
transport protocol.
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
Supported Networking 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/technologies/
tk652/tk701/technologies_white_
paper0900aecd804cd46d.html
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.
Like other VoIP protocols, SIP is designed
to address 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.
Cisco Unified IP Phones use TCP to connect
to Cisco Unified Communications Manager.
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