Chapter 3 Provisioning the Cisco HSI

H.323 Stack Configuration

Example

prov-add:name=q931,maxCalls=2000

The Update Type column in Table 3-7shows when the change to a parameter takes effect once a change is made:

•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.

Note Immediate and Next Call update types refer to dynamic system data.

Note The asterisk (*) after a parameter name in the first column of Table 3-7denotes a mandatory RADVision parameter with an inbuilt default value that will be used if the value is not set in provisioning.

Table 3-7 Q.931 Parameters

Parameter Name

Description

Type

Example

Update Type

 

 

 

 

 

responseTimeOut*

The maximum time (in seconds) permitted

INTEGER(1,200)

20

Immediate

 

to receive the first response to a call. If this

 

 

 

 

parameter expires, the call is disconnected.

 

 

 

 

 

 

 

 

connectTimeOut*

The maximum time (in seconds) the stack

INTEGER(1,20000)

180

Immediate

 

waits for call establishment after the first

 

 

 

 

response is received. If this parameter

 

 

 

 

expires, the call is disconnected.

 

 

 

 

 

 

 

 

callSignalingPort*

The number of the port receiving the calls

INTEGER(0,65535)

1720

Start

 

destined for the PGW 2200.

 

 

 

 

 

 

 

 

maxCalls*

The maximum number of simultaneous

INTEGER(0,65535)

2500

Next Call

 

calls permitted. If this parameter is

 

 

 

 

exceeded, the next call attempt returns busy.

 

 

 

 

 

 

 

 

notEstablishControl

The stack does not allow the switching of

NULL

Not present

Next Call

 

control from the Q.931 to the H.245 stack.

 

 

 

 

 

 

 

 

overlappedSending

Because the Q.931 configuration flag

NULL

Present

Immediate

 

indicates that both parties support overlap

 

 

 

 

sending, this state notifies the other party

 

 

 

 

that it can send an overlap sending message.

 

 

 

 

 

 

 

 

Note The Q.931 parameter overlappedSending has been combined with the RAS overlappedSending parameter. If you set the Q.931 overlappedSending parameter, you also set the RAS overlappedSending parameter.

 

Cisco H.323 Signaling Interface User Guide

3-12

OL-4806-01 Rev. A14

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Cisco Systems H.323 appendix Parameter Name Description Type Example Update Type, Null
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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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