Setting Overload Data

Chapter 4 Managing the Cisco HSI

Overload

The following MML commands set overload data:

set-overload:level1level2level3:cpu, lower=number, upper=number set-overload:level1level2level3:calls, lower=number, upper=number

set-overload:level1level2level3:gap, filter=normalall, percent=number

The upper parameter specifies the threshold for overload detection, and the lower parameter specifies the hysteresis point at which the overload condition is removed.

The lower value should be greater than the upper value of the next lower severity level.

For example:

set-overload:level1:cpu, lower=45, upper=50 set-overload:level1:gap, filter=normal, percent=50 set-overload:level2:cpu, lower=63, upper=70 set-overload:level2:gap, filter=normal, percent=75 set-overload:level3:cpu, lower=81, upper=90 set-overload:level3:gap, filter=normal, percent=95

These values mean that:

•At less than 50 percent CPU usage, no call is gapped.

•From 50 percent to 70 percent CPU usage, 50 percent of calls are gapped.

•From 70 percent to 90 percent CPU usage, 75 percent of calls are gapped.

•At more than 90 percent CPU usage, 95 percent of calls are gapped.

•Before the overload level returns from level 3 to level 2, the CPU usage must fall to less than 81 percent.

Note The HSI sends a Release message to the PGW when gapping calls. The cause value is derived from the property CCPackage,A_CC_GAPPEDCALLCAUSE, which is set to 60 (Congestion) in the default configuration. Cisco recommends configuring the Cisco PGW2200 dial plan to reroute the call when it receives this release cause.

Refer to the Cisco Media Gateway Controller Software Release 9 Provisioning Guide for further information.

Retrieving Overload Data

Use the rtrv-overloadMML command to display the overload status and related overload data. For information about this command, see Appendix A, “MML User Interface and Command Reference.”

	Cisco H.323 Signaling Interface User Guide
4-8	OL-4806-01 Rev. A14

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.

Cisco Systems H.323 manual Setting Overload Data, Retrieving Overload Data

Models: H.323