Cisco Cius Ikhtisar - Halaman 9

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Overview of Cisco Cius

Networking protocol

Link Layer Discovery

Protocol (LLDP)

Link Layer Discovery

Protocol-Media Endpoint

Devices (LLDP-MED)

Real-Time Transport

Protocol (RTP)

Real-Time Control

Protocol (RTCP)

Session Description

Protocol (SDP)

OL-26938-01

Purpose

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 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. RTCP is also used to

synchronize the audio and video stream

in order to provide a better video

experience.

SDP is the portion of the SIP protocol

that determines which parameters are

available during a connection between

two endpoints. Conferences are

established by using only the SDP

capabilities that are supported by all

endpoints in the conference.

Supported Networking Protocols

Usage notes

Cisco Cius supports LLDP-MED on the

media station switch 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 at this

URL:

http://www.cisco.com/en/US/

technologies/tk652/tk701/technologies_

white_paper0900aecd804cd46d.html

Cisco Cius uses RTP to send and receive

real-time voice and video traffic from

other devices and gateways.

RTCP is disabled by default, but you can

use Cisco Unified Communications

Manager to enable it on a per-device

basis.

SDP capabilities, such as codec types,

DTMF detection, and comfort noise, are

normally configured on a global basis

by Cisco Unified Communications

Manager or Media Gateway in operation.

Some SIP endpoints may allow these

parameters to be configured on the

endpoint itself.

Cisco Cius Administration Guide, Release 9.2(3)