Appendix A MML User Interface and Command Reference

h

h

The h command redisplays a command or a series of commands. Items displayed depend on a specified number or range. If no number is specified, only the last command is displayed.

h[::start=number[,end=number]]

Syntax Description

 

start

Entered as a number; specifies the first command to redisplay.

 

 

end

Entered as a number; specifies the end of the range of commands to

 

 

 

redisplay.

 

 

 

 

 

 

 

Examples

 

The MML command in the following example displays the last successful command entered:

 

 

mml> h

 

VSC H-323 Signaling Interface - H323-GW1 2000-06-20 10:04:28

M RTRV "rtrv-log:all" /* command 1 */

The MML command in the following example displays the third from the last successful command entered:

mml> h::3

VSC H-323 Signaling Interface - H323-GW1 2000-06-20 10:04:28

M RTRV "rtrv-ne"

/* command 3 */

The MML command in the following example displays the last and second to last commands entered.

mml> h::start=1,end=2

VSC H-323 Signaling Interface - H323-GW1 2000-06-20 10:04:28

M RTRV "rtrv-log:all" /* command 1 */ "rtrv-ne"

/* command 2 */

help

The help command displays a list of valid system commands and an explanation of their use. If you do not enter a command name as a parameter, the help command provides a list of MML commands, descriptions, and values. If you enter a command name as a parameter, a description of that command displays.

help[:command name]

Syntax Description

command name

The name of the MML command.

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

A-11

 

 

 

 

 

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Cisco Systems H.323 manual Help, Start, End, Redisplay, Mml hstart=1,end=2
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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.
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