Chapter 3 Provisioning the Cisco HSI

H.323 Stack Configuration

Table 3-8 RAS Parameters (continued)

 

Parameter Name

Description

Type

Example

 

Update Type

 

 

 

 

 

 

 

 

allowCallsWhenNonReg

If this parameter is present, it

NULL

Not present

 

Immediate

 

 

 

 

allows calls to proceed even

 

 

 

 

 

 

 

 

 

if gatekeeper registration has

 

 

 

 

 

 

 

 

 

not been done for the

 

 

 

 

 

 

 

 

 

PGW 2200.

 

 

 

 

 

 

 

 

 

 

 

 

 

manualRegistration

If this parameter is present,

NULL

Not present

 

Stop/Start

 

 

 

 

the stack does not perform

 

 

 

 

 

 

 

 

 

automatic gatekeeper

 

 

 

 

 

 

 

 

 

registration procedures (it

 

 

 

 

 

 

 

 

 

waits to be driven by the

 

 

 

 

 

 

 

 

 

application).

 

 

 

 

 

 

 

 

 

 

 

 

 

timeToLive

The maximum time (in

INTEGER(1, 65535)

400

 

Immediate

 

 

 

 

seconds) that the registration

 

 

 

 

 

 

 

 

 

of the PGW 2200 with a

 

 

 

 

 

 

 

 

 

gatekeeper remains valid.

 

 

 

 

 

 

 

 

 

The stack reregisters

 

 

 

 

 

 

 

 

 

periodically.

 

 

 

 

 

 

 

 

 

 

 

 

 

rasPort*

The number of the port

INTEGER(0, 65535)

0

 

Start

 

 

 

 

receiving all RAS

 

 

 

 

 

 

 

 

 

transactions for the current

 

 

 

 

 

 

 

 

 

endpoint. Set this parameter

 

 

 

 

 

 

 

 

 

to 0 to allow the software to

 

 

 

 

 

 

 

 

 

look for the available port.

 

 

 

 

 

 

 

 

 

 

 

 

 

compare15bitRasCrv

If this parameter is present, it

NULL

—

 

Immediate

 

 

 

 

causes the stack to ignore the

 

 

 

 

 

 

 

 

 

call reference value (CRV)

 

 

 

 

 

 

 

 

 

MSBit in RAS messages.

 

 

 

 

 

 

 

 

 

 

 

 

 

maxRetries*

Maximum number of RAS

INTEGER(1, 200)

3

 

Immediate

 

 

 

 

retransmissions.

 

 

 

 

 

 

 

 

 

 

 

 

 

maxMulticastTTL

Maximum number of

INTEGER(0, 200)

3

 

Start

 

 

 

 

multicast time to live (TTL).

 

 

 

 

 

 

 

 

 

 

 

 

 

preGrantedArqUse

Choice of direct or routed. If

STRING

direct

 

Next Call

 

 

 

 

direct, the pregranted

 

 

 

 

 

 

 

 

 

Admission Request (ARQ)

 

 

 

 

 

 

 

 

 

feature is used for both direct

 

 

 

 

 

 

 

 

 

and routed calls. If routed,

 

 

 

 

 

 

 

 

 

the pregranted ARQ feature

 

 

 

 

 

 

 

 

 

is used only for routed calls.

 

 

 

 

 

 

 

 

 

If absent, the pregranted

 

 

 

 

 

 

 

 

 

ARQ is not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

manualDiscovery.ipAddress

The IP address of a known

STRING

10.70.54.53

 

Start

 

 

 

 

gatekeeper with which an

 

 

 

 

 

 

 

 

 

endpoint might attempt to

 

 

 

 

 

 

 

 

 

register.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3-14

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

 

 

 

 

 

 

Page 53 Page 55
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Cisco Systems H.323 manual AllowCallsWhenNonReg If this parameter is present, it, String
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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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