Chapter 5 Troubleshooting Cisco HSI Alarms

Troubleshooting

Cause

The OVERLOAD_LEVEL3 alarm is triggered when the CPU occupancy or the number of active calls rises above the upper limits set in the overload configuration for level 3. Gapping is then initiated.

Troubleshooting

To clear the OVERLOAD_LEVEL3 alarm, complete the following steps:

Step 1 Wait for the number of calls to drop.

Step 2 If CPU occupancy remains high, request assistance from the system administrator.

VSC_FAILURE

Description

This alarm is derived by the Cisco HSI application from RUDP/SM events. This alarm is reported to the management interface and can be obtained with SNMP.

Severity Level and Trap Type

The severity level is major. The trap type is 5.

Cause

Links to both (active and standby) Cisco PGW 2200s have gone down.

Troubleshooting

To clear the VSC_FAILURE alarm, complete the following steps:

Step 1 Use the rtrv-destcommand to confirm that links to the Cisco PGW 2200s have gone down. Step 2 Check the network connections, cables, and routers.

Step 3 Refer to the Cisco Media Gateway Controller Software Release 9 Operations, Maintenance, and Troubleshooting Guide for detailed information about this alarm.

Step 4 Use the clr-almcommand to attempt to clear the alarm.

 

Cisco H.323 Signaling Interface User Guide

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OL-4806-01 Rev. A14

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Cisco Systems H.323 manual Vscfailure, Use the clr-almcommand to attempt to clear the alarm
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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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