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Configuring Dial Services
1-16 114062 Rev. A
If the backup line itself fails, an inactive backup line can replace it 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 the primary is still down, 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 to connect using one of the other telephone numbers.
For V.25bis calls, 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 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 the remote site.
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 the numbers, or it connects successfully.
Terminating the Backup Connection
The router terminates the backup circuit when it can restore the primary circuit,
the backup circuit fails, or the configured time period for the backup circuit is
over. Once the router restores the primary circuit, it checks that the backup circuit
is no longer active. If the backup is still active, the router terminates it.
Note: If you are backing up a Frame Relay primary circuit, the router, not the
network, activates and terminates the Frame Relay backup connection. The
router rejects incoming calls from the Frame Relay network.
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