Cisco Systems 78-11324-02 manual Overview of VHM, How VHM Works

Chapter 1 Voice Health Monitor Overview

Overview of VHM

Overview of VHM

VHM helps network administrators and network operators determine and maintain the stability of the VoIP network within their enterprise. VHM achieves this goal by using:

•A series of availability and health checks on the VoIP equipment in the network.

•A fault detection and escalation system to notify the users of any faults or exceptions detected.

VHM integrates with network management systems (NMSs) such as HP

OpenView Network Node Manager.

With VHM, you can:

•Discover VoIP network devices and applications on a user-entered schedule

•Monitor faults in voice and data networks

•Run synthetic transaction tests, to check Cisco CallManager functions

•Check the availability and health of VoIP equipment and applications

•Obtain the status of each voice device group, such as Voice Cluster, Voice Gateway, Phone Access Switches, and Work Flow Applications

•Discover and manage Ethernet ports that have IP Phones connected to them

•Monitor IP phones in the network

How VHM Works

VHM manages the voice-specific devices in the network by polling information from managed devices, as well as processing SNMP Traps generated by the devices. VHM relies on DFM to receive the SNMP Traps. VHM does not duplicate queries for information collection, but shares the information collected by DFM.

Any polling analysis done in DFM can be leveraged by VHM. When polling devices, DFM monitors generic parameters, while VHM monitors voice-specific parameters. When VHM is used in conjunction with DFM, users can detect generic faults that are causing VoIP disruptions.

	User Guide for Voice Health Monitor
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