Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 37)

Dial Services Overview

1-11

To ensure that dial backup operates properly, make certain that you enable

protocols for the primary circuit as well as for the slot with the backup lines.

To determine which protocols are enabled on a slot, select the Tools➔Statistics

Manager option from the Site Manager main window. The Statistics Manager

window appears, listing each active circuit, its slot, connector, and the protocols

enabled on it. For more information on statistics, see Managing Routers and BNX

Platforms.

Activating the Backup Line

When the router detects a failure on the primary line, it selects a line from a

backup pool. The router activates a backup line under any one of the following

conditions:

• The primary circuit is not operating.

• All of the primary circuit’s lines have failed.

• An active backup line has failed. A inactive backup line can provide backup

for an active backup line only if you conﬁgure multiple lines in the backup

pool. If the ﬁrst line fails for every phone number in the router’s phone list,

and there is still data to send, the router tries the next line in the pool.

Retry Attempts to Establish the Connection

If the remote site has several different telephone lines attached to individual dial

units, the backup circuit uses the telephone numbers stored in the primary circuit’s

record to connect to the site. If one telephone number fails, the backup line

attempts a connection using one of the other telephone numbers.

For V.25bis, the router redials the same number until its retry attempts reach the

maximum retry count that you specify in the modem parameters. If the router

cannot establish the connection using the current phone number, it tries the next

number in its phone list. It continues trying until it has gone through all the

numbers, or it connects to the remote site.

For ISDN, the router sends a call setup message for each number in the phone list.

If the router cannot make a connection using the current phone number, it tries the

next number in its phone list. It continues trying until it has gone through all the

numbers, or it connects to its destination.

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Avaya Configuring Dial Services Manual de usuario Pagina 37