Chapter 4 Managing the Cisco HSI

Overload

Table 4-3 H.245 Counter Group (continued)

Counter Name

Measurement

Type

Comments

 

 

 

 

ASYMMETRIC_TOT

H245

Integer

Incremented for each asymmetric

 

 

 

condition encountered. Collection

 

 

 

intervals are provisionable (default is 12

 

 

 

hours).

 

 

 

 

DTMF_ RELAY_ TOT

H245

Integer

Incremented for each call where DTMF

 

 

 

relay is used. Collection intervals are

 

 

 

provisionable (default is 12 hours).

 

 

 

 

Resetting Measurements

The clr-measMML command resets the measurement counters. This command resets an individual counter or all counters in a counter group. The following are valid counter groups:

•RAS

•Q.931

•H.245

For more information about the clr-meascommand, see Appendix A, “MML User Interface and Command Reference.”

Retrieving Counters

Use the rtrv-ctrMML command to retrieve measurement counters. This command displays the measurements for a counter group. Valid counter groups are RAS, Q.931, and H.245. For more information about the rtrv-ctrcommand, see Appendix A, “MML User Interface and Command Reference.”

Overload

The system continuously checks call totals and CPU utilization. Each of these values is compared to predefined limits. Three call total limits are available. Each limit has a hysteresis value and an alarm associated with it. When the call total reaches the limit, an alarm is raised. When the call total falls below the limit minus the hysteresis value, the alarm is cleared after the appropriate recovery action is taken.

Cisco HSI supports the following three levels of overload:

•Overload level 1

•Overload level 2

•Overload level 3

The following factors can trigger any one of the overload levels:

•CPU usage (the OVLDSAMPLERATE parameter defines the frequency of CPU sampling and threshold checking)

•Maximum calls allowed

 

Cisco H.323 Signaling Interface User Guide

4-6

OL-4806-01 Rev. A14

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Cisco Systems H.323 manual Overload, Resetting Measurements, Retrieving Counters
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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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