Cisco Ip Phone 8800 Series Multiplatform Phones Administration Guide - Cisco 8851 Administration Manual

Network Protocols
Network protocol
Internet Protocol (IP)
Link Layer Discovery Protocol
(LLDP)
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Real-Time Transport Protocol
(RTP)
Real-Time Control Protocol
(RTCP)

Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide

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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 for voice
products.
RTP is a standard protocol for transporting real-time data,
such as interactive voice, 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
To communicate using IP, network
devices must have an assigned IP
address, subnet, and gateway.
IP addresses, subnets, and gateway
identifications are automatically
assigned if you are using the Cisco
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 IP Phone supports
LLDP on the PC port.
The Cisco 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 IP Phones use the RTP
protocol to send and receive
real-time voice traffic from other
phones and gateways.
RTCP is disabled by default.