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RE: ISDN Backup [7:67195] posted 04/17/2003
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You could use a dialer string. also you would want to run

debug dialer
debug isdn q931
debug ppp nego

dialer string example

interface Dialer1
  no ip directed-broadcast
  encapsulation ppp
  no ip split-horizon
  dialer in-band
  dialer idle-timeout 60
  dialer string xxxxxxxxxxx class xxxBRI
  dialer string xxxxxxxxxxx class xxxBRI
  dialer hold-queue 10
  dialer load-threshold 2 either
  dialer-group 1
  no cdp enable
  ppp authentication chap

it will call the first number and then go down the list. If the 1st one
fails it will call the second one

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