Preface

Document Conventions

Appendix E, “E-ISUP Cause Value-to-Name Lookup”

Appendix F, “H.323 Name-to-Cause Value Lookup”

Appendix G, “H.323 Cause Value-to-Name Lookup”

Document Conventions

This manual uses the document conventions listed in this section.

Table 1

Document Conventions

 

 

 

 

 

 

Convention

 

Meaning

Comments and Examples

 

 

 

 

Boldface

 

Commands and keywords you

prov-sta

 

 

enter literally as shown

 

 

 

 

 

 

Italics

 

Variables for which you supply

command interface type

 

 

values

You replace the variable with

 

 

 

 

 

 

the type of interface.

 

 

 

 

Courier

 

Font used for screen displays,

Are you ready to continue?

 

 

prompts, and scripts.

[Y]

 

 

 

 

Courier bold

Font used to indicate what the user

Login: root

 

 

enters in examples of command

Password: <password>

 

 

environments.

 

 

 

 

 

Square brackets ([ ])

Optional elements

command [abc]

 

 

 

abc is optional (not required),

 

 

 

but you can choose it.

 

 

 

Vertical bars ( )

Separated alternative elements

command [abc def]

 

 

 

You can choose either abc or

 

 

 

def, or neither, but not both.

 

 

 

Braces ({ })

Required choices

command {abc def}

 

 

 

You must use either abc or def,

 

 

 

but not both.

 

 

 

Braces with vertical bars within

A required choice within an

command [abc{ def ghi}]

square brackets ([{ }])

optional element

You have three options:

 

 

 

 

 

 

No entry

 

 

 

abc def

 

 

 

abc ghi

 

 

 

 

A string

 

A nonquoted set of characters

For example, when setting an

 

 

 

SNMP community string to

 

 

 

public, do not use quotation

 

 

 

marks around the string;

 

 

 

otherwise, the string will

 

 

 

include the quotation marks.

 

 

 

 

 

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

xv

 

 

 

 

 

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Cisco Systems H.323 manual Document Conventions, Meaning Comments and Examples, Boldface, Prov-sta, Command abc

H.323 specifications

Cisco Systems H.323 is a set of standards designed for transmitting audio, video, and data over packet-switched networks. It is a critical technology that enables real-time communication and has become integral to the world of VoIP (Voice over Internet Protocol) and video conferencing applications. Originally developed by the ITU-T, H.323 has been widely adopted and implemented by Cisco Systems, allowing organizations to leverage reliable and scalable communication solutions.

One of the standout features of H.323 is its ability to support interoperability among varying equipment and platforms. This means that devices from different manufacturers can communicate seamlessly, which is vital in a diverse technical environment. H.323 does this by defining protocols that handle signaling, media transport, and control, ensuring that various systems can work together effectively.

Key technologies utilized within H.323 include H.225 and H.245 signaling protocols. H.225 is responsible for call setup and management, establishing communication between endpoints. In contrast, H.245 manages the negotiation of media channels, allowing devices to configure themselves based on the capabilities of each other. This adaptability is crucial for dynamic network conditions typical in VoIP applications.

Another defining characteristic of H.323 is its support for multiple types of multimedia communication, including point-to-point and multipoint calls. This flexibility supports everything from simple audio calls to complex videoconferencing setups, where many participants can share video and audio streams concurrently. Cisco enhances this capability through its hardware and software offerings, optimizing performance for conference calls.

H.323 also features robust error resilience mechanisms. This ensures that real-time data, which is typically sensitive to delays and losses, can be transmitted with minimal disruption. Moreover, it facilitates quality of service (QoS) implementation, allowing organizations to prioritize voice and video traffic over less critical data services, thereby improving the overall user experience.

In conclusion, Cisco Systems H.323 stands out as a comprehensive solution for real-time communication over packet-based networks. Its main features, including interoperability, multimedia support, and enhanced error resilience, position it as a relevant technology in both corporate and personal communication settings. As organizations continue to adopt cloud and hybrid communication models, H.323 remains a reliable backbone for ensuring connectivity and collaboration across diverse platforms.