Chapter 3 Provisioning the Cisco HSI

H.323 Stack Configuration

RAS Parameters

Note

Note

Note

The parameters in Table 3-8are required for RAS stack initialization. To modify the RAS parameters, use the ras MML name variable for the prov-add, prov-dlt,and prov-edcommands.

In the following example, the prov-addcommand sets the RAS parameter maxfail to the value 3.

Example

prov-add:name=ras,maxfail=3

The array index [i] in some of the parameter names in the first column of Table 3-8must be replaced with a valid braced index from 1 to 20, and must be continuous and unique (that is, it must contain no duplicates).

The Update Type column in Table 3-8shows when the change to a parameter takes effect after it is modified:

Immediate means that the effect of the change is immediate.

Start means that the application needs to be restarted for the change to take effect.

Next Call means that the next call has the new parameter set.

Immediate and next call update types are dynamic system data.

The RAS parameter overlappedSending is not available here because it has been combined with the Q.931 overlappedSending parameter. If you set the Q.931 overlappedSending parameter, you also set the the RAS overlappedSending parameter.

The asterisk (*) after a parameter name in the first column of Table 3-8denotes a mandatory RADVision parameter with an inbuilt default value that will be used if the value is not set in provisioning.

Table 3-8 RAS Parameters

 

Parameter Name

Description

Type

Example

Update Type

 

 

 

 

 

 

 

manualRAS

If this parameter is present,

NULL

Start

 

 

the stack does not perform

 

 

 

 

 

 

 

 

automatic RAS procedures

 

 

 

 

 

 

 

 

(it waits to be driven by the

 

 

 

 

 

 

 

 

application).

 

 

 

 

 

 

 

 

 

 

 

 

 

responseTimeOut*

The time (in seconds) that

INTEGER(1, 200)

10

Immediate

 

 

the stack waits until it

 

 

 

 

 

 

 

 

notifies the application that

 

 

 

 

 

 

 

 

the called party has failed to

 

 

 

 

 

 

 

 

respond to a transaction.

 

 

 

 

 

 

 

 

 

 

 

 

 

maxFail*

Maximum number of retry

INTEGER(1, 200)

3

Immediate

 

 

gatekeeper registration

 

 

 

 

 

 

 

 

attempts.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

 

 

 

3-13

 

 

 

 

 

 

 

 

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Cisco Systems H.323 manual RAS Parameters, Parameter Name Description Type Example, ManualRAS If this parameter is present

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.