Editing Dial-on-demand routing (section)

==Why DDR is still used today==

Despite its drawbacks, there are two important reasons why Dial-on-Demand routing is used today: reliability and cost. These two factors become exceedingly important when a company has multiple locations that need to communicate with one another on a regular basis.

If a company or organization communicates between its different branches or firms regularly, it will most likely lease a dedicated cable line to connect each of the branches together. These lines are not always reliable meaning one branch may be cut off from the rest. In situations like this, having a backup connection ready is essential. Since DDR uses existing telephone lines, a DDR connection will almost always be available as a backup solution.

A second reason why DDR is still used is because it’s cheap. Leasing cable lines can be needlessly expensive if information isn’t constantly being sent back and forth between branches. This makes DDR very cost effective.