Cisco Systems H.323 appendix Nonprovisionable Data, MML Provisionable Data, System Parameters

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Chapter 3 Provisioning the Cisco HSI

H.323 Stack Configuration

Nonprovisionable Data

The parameters in Table 3-5cannot be altered through MML commands.

Table 3-5 Nonprovisionable Data Parameters

H323_SYS

Description

 

 

system.manualstart

Present

 

 

system.pdlname

Absent

 

 

system.delimiter

#FF

 

 

ras.gatekeeper

Absent

 

 

ras.rasmulticastaddress

224.0.1.41.1718

 

 

h245.capabilities.manualoperation

Present

 

 

h245.masterslave.manualoperation

Present

 

 

q931.manualaccept

Present

 

 

q931.earlyH245

Present

 

 

q931.autoanswer

Present

 

 

q931.manualcallprocessing

Present

 

 

q931.h245tunneling

Present

 

 

MML Provisionable Data

H.323 System Parameters

The parameters in Table 3-6are required for H.323 stack initialization. To modify the parameters in Table 3-6, use the h323_sys MML name variable for the prov-add, prov-dlt,and prov-edcommands. Stop and restart the application for these changes to take effect.

Note The asterisk (*) after a parameter name in the first column of Table 3-6denotes a mandatory RADVision parameter that has an inbuilt default value if a value is not set in provisioning.

Table 3-6 H.323 System Initialization Parameters

Parameter

Description

Type

Example

 

 

 

 

maxCalls*

Maximum number of concurrent calls allowed

INTEGER(0, 65535)

2500

 

 

 

 

maxChannels*

Maximum number of concurrent channels allowed

INTEGER(0, 65535)

2

 

 

 

 

Q.931 Parameters

 

 

To modify the parameters listed in Table 3-7, use the q931 MML name variable for the prov-add,

 

 

prov-dlt, and prov-ed commands.

 

 

In the following example, the prov-addcommand sets the Q.931 parameter maxCalls to the value 2000.

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

3-11

 

 

 

 

 

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Contents Provisioning the Cisco HSI Description MML Configuration CommandsCommand Command DescriptionVerifying the Configuration Introduction to MML Command Operation for HSIInitiating an MML Session to Enable Dtmf on the HSI Example System Configuration DataReverting to the Base Configuration Static System DataParameter Type Description Parameter, set it to Enabled Changing Static System Data Issue the command restart-softwconfirmDynamic System Data Parameter Description DefaultOVLDLEVEL1THRESHLOWER OVLDLEVEL1PERCENTOVLDLEVEL3PERCENT OVLDLEVEL1FILTEROVLDLEVEL3THRESHUPPER AlarmdebouncetimeOVLDLEVEL3FILTER OVLDLEVEL3THRESHLOWERParameters Nonprovisionable DataMML Provisionable Data System 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 Parameter Name Parameter Value Description Codec SelectionQuick Reference for Important Parameters 14presents important static system data parameters Parameter Name Parameter Values Description VSCBPORTNUMBER1/2 VSCBIPADDR1/2Parameter Name Parameter Value HSI Feature ConfigurationHairpin Asymmetric Codec TreatmentEmpty Capability Set 38 Fax Configuring T.38 Fax on the Cisco Pstn GatewayConfiguring T.38 Fax on a Cisco IOS H.323 Gateway Configuring T.38 Fax on a Cisco IOS Mgcp GatewayHSI 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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