Cisco Systems H.323 appendix OVLDLEVEL3FILTER, OVLDLEVEL3THRESHLOWER, OVLDLEVEL3THRESHUPPER

Page 10

Chapter 3 Provisioning the Cisco HSI

H.323 Stack Configuration

Table 3-4 Dynamic System Data Parameters (continued)

Parameter

Description

Default

 

 

 

OVLDLEVEL3PERCENT

Indicates what percentage of calls should be rejected when an

90

 

overload condition occurs. The parameter is used in conjunction with

 

 

the OVLDLEVEL3FILTER parameter. This is the highest level of

 

 

overload and must be greater than or equal to the provisioned values

 

 

for OVLDLEVEL1PERCENT and OVLDLEVEL2PERCENT.

 

 

Note If this value is set to zero, no overload treatment occurs (by

 

 

definition, the level 1 and level 2 values must also be zero).

 

 

 

 

OVLDLEVEL3FILTER

Indicates what call types should be gapped if an overload level 3

Normal

 

condition occurs (see OVLDLEVEL1FILTER).

 

 

 

 

OVLDLEVEL3THRESHLOWER

Determines the number of active calls below which the application

2300

CALLS

load must fall in order to remove the overload level 3 condition.

 

 

 

 

OVLDLEVEL3THRESHUPPER

Determines how many simultaneous active calls trigger an overload

2400

CALLS

level 3 condition.

 

 

 

 

OVLDLEVEL3THRESHLOWER

Determines the level of CPU utilization below which the application

85

CPU

must fall in order to remove the overload level 3 condition.

 

 

 

 

OVLDLEVEL3THRESHUPPER

Determines the level of CPU utilization that triggers an overload

95

CPU

level 3 condition.

 

 

 

 

CIAGENTSCANPERIOD

Specifies the frequency with which the CIagent polls the CPU

—

 

utilization.

 

 

 

 

ALARMDEBOUNCETIME

Specifies the length of time that an alarm condition must persist

0

 

before being reported, and any associated action taken.

 

 

 

 

CALLREFERENCEUSAGE

Determines which call reference identity is passed on to the

—

 

PGW 2200 (call reference field or Conference ID).

 

 

 

 

DISKUSAGELIMIT

Represents a percentage of disk occupancy.

95

 

The application continually polls the system for disk occupancy, and

 

 

if the percentage rises above the limit set by DISKUSAGELIMIT, the

 

 

LOW_DISK_SPACE alarm is raised.

 

 

DISKUSAGELIMIT has a default value of 95 percent. The value

 

 

range is 0–100, inclusive. When dynamically provisioned, the

 

 

parameter DISKUSAGELIMIT, if not set within that range, is set to

 

 

the default value (95) and the CONFIGURATION_ FAILURE alarm

 

 

is raised.

 

 

 

 

RegFailureReleaseCause

This parameter specifies the Q.850 release cause, which the HSI uses

—

 

after the HSI fails three times to register to a gatekeeper.

 

 

This parameter is assigned a value in the range 1—127

 

 

 

 

H.323 Stack Configuration

The parameter name is based on the ASN.1 paths; but, in some cases, the parameter name has been shortened for convenience. For example, “capabilities” has been shortened to “caps.”

The case of the parameter name reflects exactly the ASN.1 definitions; but, case is not important to MML configuration.

 

Cisco H.323 Signaling Interface User Guide

3-10

OL-4806-01 Rev. A14

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Contents Provisioning the Cisco HSI Command Description MML Configuration CommandsCommand DescriptionInitiating an MML Session to Enable Dtmf on the HSI Introduction to MML Command Operation for HSIVerifying the Configuration Static System Data System Configuration DataReverting to the Base Configuration ExampleParameter Type Description Parameter, set it to Enabled Issue the command restart-softwconfirm Changing Static System DataParameter Description Default Dynamic System DataOVLDLEVEL1FILTER OVLDLEVEL1PERCENTOVLDLEVEL3PERCENT OVLDLEVEL1THRESHLOWEROVLDLEVEL3THRESHLOWER AlarmdebouncetimeOVLDLEVEL3FILTER OVLDLEVEL3THRESHUPPERSystem Parameters Nonprovisionable DataMML Provisionable Data ParametersParameter Name Description Type Example Update Type NullRAS Parameters Parameter Name Description Type ExampleAllowCallsWhenNonReg If this parameter is present, it String H323ESP Update Parameter Name TypeINTEGER0,1 Quick Reference for Important Parameters Codec SelectionParameter Name Parameter Value Description 14presents important static system data parameters Parameter Name Parameter Values Description VSCBIPADDR1/2 VSCBPORTNUMBER1/2HSI Feature Configuration Parameter Name Parameter ValueEmpty Capability Set Asymmetric Codec TreatmentHairpin Configuring T.38 Fax on a Cisco IOS Mgcp Gateway Configuring T.38 Fax on the Cisco Pstn GatewayConfiguring T.38 Fax on a Cisco IOS H.323 Gateway 38 FaxConfiguring Clear Channel on the Cisco HSI HSI Support for Tech PrefixesClear Channel Parameters Example Value Example Configuration Configuring G.726 on the Cisco HSI Parameter Example Value Configuration Example Configuring the Payload Type for the MgcpConfiguring Cisco HSI g726-generic OL-4806-01 Rev. A14 Configuring G.729 Annex and G.729 Annex B ParameterOL-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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