When configuring a backup line there is an option for “randomize-timers” to randomize dial timers to minimize resource contention. Why is this necessary?
There is a need to randomize timers so that if the primary interface becomes unavailable, both sides do not place a call at the same time. This is referred to as “call collision or contention”. This is the “busy” signal. For example: you and I are in a mobile phone call conversation within the building here and yet both near our desks. Because of poor coverage the call drops. You and I attempt to use our desk phones and pick up the handset, go off hook, at the same time. You dial be for me and if it were not for our multi-line phones you would get a busy signal. The same happens in the world of backup links. One side has to be allowed to win if multiple attempts are made.
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