Avaya Configuring Dial Services Manuale Utente Scaricare il pdf (Pagina 49)

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Dial Services Overview

117353-B Rev. 00

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Reestablishing the Backup Connection

If the remote site has several 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 to

connect using one of the other telephone numbers.

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

reach the maximum retry count that you specify in the modem parameters. 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 of the

numbers or it connects successfully.

For ISDN calls, 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 of the numbers or it connects successfully.

Terminating the Backup Connection

The router terminates the backup circuit once it restores the primary circuit, the

backup circuit fails, or the configured time period for the backup circuit has

expired. Once the router restores the primary circuit, it verifies that the backup

circuit is no longer active. If the backup is still active, the router terminates it.

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Avaya Configuring Dial Services Manuale Utente Pagina 49

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