Chapter 3 Provisioning the Cisco HSI

HSI Feature Configuration

Support for the H.225 INFORMATION message is enabled by default. A crafts person can disable H.255 INFORMATION message support through a new property called Information MsgDisabled by issuing the following MML command:

prov-add:name=sys_config_static,informationmsgdisabled = "True"

HSI Support for Tech Prefixes

The Cisco HSI now maps the '*' (asterisk, or star) and '#' (number sign, or hash) H.225 prefixes to the PGW for H.323 to PSTN calls as follows:

•'*' to the value provisioned in ccpackage.Star

•'#' to the value provisioned in ccpackage.Hash

•The current value for ccpackage.Star is 'B'.

•The current value for ccpackage.Hash is 'A'.

The crafts person can change these values by issuing the following MML command:

prov-ed:name=ccpackage,hash='C'

Cisco HSI now maps the EISUP 'B' to '*' and 'C' to '#' (Called Party Number) for PSTN to H.323 calls.

Configuring Clear Channel on the Cisco HSI

The Clear Channel capability (identified as G.Clear or gclear in this document) enables support for both voice and data calls on a network. However, the end applications are responsible for packet loss and error recovery. For more information, refer to the document G.Clear, GSMFR, and G.726 Codecs and Modem and Fax Passthrough for Cisco Universal Gateways at http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00800b3568

.html.

Note In association with the Cisco HSI, the Cisco PGW must be running 9.5(2) patch set gs034/nn028, or later, to use G.Clear.

The Cisco HSI interoperates with Cisco voice gateways (for example, the Cisco AS54xx series or VISM), which advertises G.Clear capability via MGCP signaling using the following methods: G.Clear, G.nX64, CCD. The Cisco HSI automatically selects the correct method depending on the gateway that originates or terminates the call.

Refer to the Cisco H.323 Signaling Interface User Guide for information regarding the use of HSI MML commands.

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

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Cisco Systems H.323 appendix HSI Support for Tech Prefixes, Configuring Clear Channel on the Cisco HSI
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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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