Avaya VoIP Monitoring Manager Release 3.1 Configuration Manuel d'utilisateur télécharger pdf (Page 45)

Time-To-Live (TTL)

Issue 7 February 2006 45

Silence Suppression In Voice over IP (VoIP), silence suppression is a method of detecting the

silence in audio and purposefully dropping silent packets at the sender to

conserve network bandwidth. The receiver will generate comfort noise or

conceal the loss of packets when packets are dropped. Because the receiver

conceals loss and generates comfort noise, silence suppression is usually

imperceptible to the listener. The Silence Suppression field will be reported as

enabled, disabled or unknown.

Session Table The Session Table is one of the exported tables containing data that generally

remains the same during a session. As a result, there is one entry per session

in this table. The Session table will display in Microsoft Excel at the top of the

same worksheet as the Time-varying Data table and the Trace Route table.

The data in the Session table is indexed by SessionID and ParticipantID.

SessionID The SessionID column assigns a unique identifier to each session in the

exported file. Each exported session contains three sets of data. This data is

listed in three separate tables that are separated by a blank row: Session

Table, Time-varying Data Table, and the TraceRoute Table. Use the

SessionID to identify the session in each table to analyze the data.

StartTime The StartTime column in the exported file displays the date and time the

session started. This column appears in the Session Table of the exported file.

TimeOffset The TimeOffset column displays the number of seconds since the session

started for this set of data. This column appears in the Time-varying Data

Table of the exported file.

Time-varying Data

Table

The Time-varying Data table is one of the exported tables containing the

time-varying data for the sessions in the Session table. The data in this table is

indexed by SessionID, ParticipantID, and a time offset. The SessionID and

ParticipantID enable the data to be linked to corresponding sessions in the

Session table. The time offset indicates when this set of information was

reported (in seconds since the start of each call). The Time-varying Data table

will display in Microsoft Excel below the Session Table on the same

worksheet. To view the information more easily, you may want to copy the

table and paste it to another worksheet.

Time-To-Live (TTL) Time-to-live (TTL) is a value in an Internet Protocol (IP) packet that tells a

network router if a packet has been forwarded towards its destination too

many times and should be discarded. For a number of reasons, packets may

not get delivered to their destination in a reasonable length of time. For

example, a combination of incorrect routing tables could cause a packet to

loop endlessly. A solution is to discard the packet after the packet has been

forwarded a certain number of times and send a message to the originator,

who decides whether to resend the packet.

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Avaya VoIP Monitoring Manager Release 3.1 Configuration Manuel d'utilisateur Page 45

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