Cisco Systems H.323 appendix Provisioning the Cisco HSI

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C H A P T E R 3

Provisioning the Cisco HSI

Introduction

This chapter describes the data that must be provisioned for the Cisco H.323 Signaling Interface (HSI). The data is divided into two areas: system configuration and H.323 stack data. This chapter contains the following sections:

•Cisco HSI Configuration, page 3-1

•H.323 Stack Configuration, page 3-10

•HSI Feature Configuration, page 3-22

Cisco HSI Configuration

All configuration data is contained within configuration files. Cisco HSI starts with an initial configuration file in $GWHOME/currentGW/etc/GWmain.conf. This file is created during installation of the software.

The configuration data within the file is defined as dynamic, static, or constant:

•Dynamic data can be modified by a provisioning session (see Appendix A, “MML User Interface and Command Reference”). It can be activated on the currently running Cisco HSI.

•Static data can be modified by a provisioning session but cannot be activated on a running Cisco HSI. Changes to dynamic and static data can be written to a separate provisioning file (in $GWHOME/currentGW/var/prov/configname/session.dat) that can be used during subsequent restarts of the Cisco HSI.

•Constant configuration data is contained within the configuration file and cannot be modified by provisioning sessions. Constant configuration data can be modified only by system technicians or administrators who use UNIX editing tools. This data is replicated from the initial configuration file into the provisioning files, and is included in subsequent provisioning sessions.

Examples of the use of constant data are given in Appendixes D, E, F, and G. These appendixes determine the mapping of cause values for incoming and outgoing H.323 and Enhanced ISDN User Part (E-ISUP) messages. System technicians can modify these values in the initial configuration file to explicitly choose the mappings for their system.

When a provisioning session creates a new configuration file, it also verifies that provisioned data is within allowable ranges and indicates this in the start of the file. It checksums the configuration file and writes the checksum as $GWHOME/currentGW/var/prov/configname/checksum.dat. When the Cisco

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

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Contents Provisioning the Cisco HSI Command MML Configuration CommandsCommand Description DescriptionInitiating an MML Session to Enable Dtmf on the HSI Introduction to MML Command Operation for HSIVerifying the Configuration Reverting to the Base Configuration System Configuration DataStatic System Data ExampleParameter Type Description Parameter, set it to Enabled Changing Static System Data Issue the command restart-softwconfirmDynamic System Data Parameter Description DefaultOVLDLEVEL3PERCENT OVLDLEVEL1PERCENTOVLDLEVEL1FILTER OVLDLEVEL1THRESHLOWEROVLDLEVEL3FILTER AlarmdebouncetimeOVLDLEVEL3THRESHLOWER OVLDLEVEL3THRESHUPPERMML Provisionable Data Nonprovisionable DataSystem Parameters ParametersNull Parameter Name Description Type Example Update TypeParameter Name Description Type Example RAS ParametersAllowCallsWhenNonReg If this parameter is present, it String H323ESP Parameter Name Type UpdateINTEGER0,1 Quick Reference for Important Parameters Codec SelectionParameter Name Parameter Value Description 14presents important static system data parameters Parameter Name Parameter Values Description VSCBPORTNUMBER1/2 VSCBIPADDR1/2Parameter Name Parameter Value HSI Feature ConfigurationEmpty Capability Set Asymmetric Codec TreatmentHairpin Configuring T.38 Fax on a Cisco IOS H.323 Gateway Configuring T.38 Fax on the Cisco Pstn GatewayConfiguring T.38 Fax on a Cisco IOS Mgcp Gateway 38 FaxHSI Support for Tech Prefixes Configuring Clear Channel on the Cisco HSIClear Channel Parameters Example Value Example Configuration Configuring G.726 on the Cisco HSI Configuring the Payload Type for the Mgcp Parameter Example Value Configuration ExampleConfiguring Cisco HSI g726-generic OL-4806-01 Rev. A14 Parameter Configuring G.729 Annex and G.729 Annex BOL-4806-01 Rev. A14
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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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