Chapter 4 Managing the Cisco HSI

Measurements

Call-Related Measurements

The Cisco HSI application handles all call-related measurements. An SNMP MIB handles the collection of call-related measurement data.

The call-related measurements are organized into counter groups. The following MML counter groups are required:

RAS (see Table 4-1 on page 4-3)

Q.931 (see Table 4-2 on page 4-4)

H.245 (see Table 4-3 on page 4-5)

The measurements in these groups are written to a file on disk every 30 minutes. The file name includes the date and time that measurements were written to disk.

Table 4-1 RAS Counter Group

 

 

 

 

 

 

 

Counter Name

Measurement

Type

Comments

 

 

 

 

GK_DISC_ATT_TOT

Gatekeeper discovery

Integer

Incremented for every unicast gatekeeper request

 

attempts

 

(GRQ) sent or for every multicast operation

 

 

 

 

GK_REG_ATT_TOT

Registration request

Integer

Incremented for every registration request (RRQ)

 

attempts

 

sent

 

 

 

 

GK_REG_SUCC_TOT

Registration request

Integer

Incremented for every registration confirmation

 

successes

 

(RCF) received

 

 

 

 

GK_RCV_UNR_ATT_TOT

GK- initiated

Integer

Incremented for every unregistration request (URQ)

 

unregistration attempts

 

received from a gatekeeper (GK)

 

 

 

 

GK_XMIT_UNR_SUCC_TOT

GK-initiated

Integer

Incremented for every unregistration confirmation

 

unregistration successes

 

(UCF) sent to a GK

 

 

 

 

GK_XMIT_UNR_ATT_TOT

T- initiated unregistration

Integer

Incremented for every URQ sent to a GK

 

attempts

 

 

 

 

 

 

GK_RCV_UNR_SUCC_TOT

T- initiated unregistration

Integer

Incremented for every UCF received from a GK

 

successes

 

 

 

 

 

 

GK_RLS_ATT_TOT

Disengage attempts

Integer

Incremented for every disengage request (DRQ) sent

 

 

 

to a GK

 

 

 

 

GK_RLS_SUCC_TOT

Disengage successes

Integer

Incremented for every disengage confirmation (DCF)

 

 

 

returned by a GK

 

 

 

 

GK_INFO_REPORT_TOT

Information reports

Integer

Incremented for every information request (IRQ) sent

 

 

 

to the GK

 

 

 

 

 

 

Cisco H.323 Signaling Interface User Guide

 

 

 

 

 

 

OL-4806-01 Rev. A14

 

 

4-3

 

 

 

 

 

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Cisco Systems H.323 manual Call-Related Measurements, Counter Name Measurement Type Comments

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.