Avaya Configuring Dial Services Manual de usuario Pagina 94

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Configuring Dial Services
2-20 114062 Rev. B
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circuit is no longer active.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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