Avaya VoIP Monitoring Manager Release 3.1 Configuration Manuel d'utilisateur télécharger pdf (Page 46)

TOOL

46 Avaya VoIP Monitoring Manager Release 3.1 Configuration

The initial TTL value is set, usually by a system default, in a field of the IP

packet header with a value in the range 0 to 255. The original idea of TTL was

that it would specify a certain time span in seconds that, when exhausted,

would cause the packet to be discarded.

Since each router is required to subtract at least one count from the TTL field,

the count usually indicates the number of router hops the packet has

remaining before it must be discarded. Each router that receives a packet

subtracts one from the count in the TTL field. When the count reaches zero,

the router detecting it discards the packet and sends an Internet Control

Message Protocol (ICMP) message back to the originating host.

TOOL The TOOL value is the name and version of the application generating the

stream, e.g., Avaya VoIP Engine v.123. This information may be useful for

diagnosis. The TOOL value should remain constant for the duration of the

session.

Trace Route Table The Trace Route table contains information about the route in the network that

the RTP packets traverse between the two endpoints of the call. It will display

in Microsoft Excel below the Time-varying Data table.

Trap or Alarm A Trap or Alarm is a message sent by a Windows SNMP Agent to a Trap

Manager, console, or terminal to indicate the occurrence of a significant event,

such as a specifically defined condition or a threshold that was reached. It is

also referred to as an Alarm. The Trap Manager is generally configured to be

the Gateway Alarm Manager (GAM) or Network Alarm Manager (NAM) but

any Trap Manager application can be used with the Avaya VoIP Monitoring

Manager.

VoIP or Voice over

Internet Protocol

VoIP is an acronym for Voice over Internet Protocol. This is the technology

standard that allows Internet telephony. It provides the capability for live voice

communication over the Internet so that you can talk using the multimedia

capabilities of your computer, in the same way you would talk using a

telephone.

Windows SNMP

Agent

The Simple Network Management Protocol (SNMP) Agent is the Windows

SNMP service that runs on your computer. SNMP is a protocol for

communications between remote network management stations and

managed network elements (such as Avaya devices).

The VoIP Monitoring Manager Server needs the Windows SNMP Agent

installed as it enables the RTCP Monitor to collect and publish the data. The

Windows SNMP service is provided with the Windows 2000 CD but is not

installed by default. You will be prompted during the VoIP Monitoring Manager

install to install it from the Windows 2000 CD.

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Avaya VoIP Monitoring Manager Release 3.1 Configuration Manuel d'utilisateur Page 46

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